2.5 update just released on April 4th. If someone who has a Subscribestar account would be a legend and post it here, I'd appreciate it. Also, what's the content roadmap look like?
Some suggestions for future updates (someone with a Subscribestar account, please pass these along to the developer in a comment and make sure he sees it; just copy and paste the below block of text):
1. Let us edit the size of the balls with a slider (they're unrealistically large for anything except a draft horse in summer right now lol)
2. Increase (or hopefully let us choose with a slider) the total number of jets during the orgasm. 4 jets is unrealistically low (unless the horse has been bred too much that day and is completely "spent" and needs to recover); usually the average for a fit stallion is between 8 and 10 jets. 6 at the lowest, up to about 12-14 if they've been teased a LOT for a long time and get super horny before finally being able to mount. Please add a slider for "orgasm jet duration" and "time between jets" also, as it is they last too long. Each jet should only be about a third to half of a second long, with about a fifth to a third of a second pause between each. Letting us choose the distance the jets can go (within a range, each individual jet of the orgasm will go its own random distance between X to Y feet forward; or consistently all the same distance if both values (min & max) were set the same?) would be great too, but I don't know if that's technically possible with how the fluid simulation works. If that is possible, and you want to add even more realism, let us set a bell curve or slider for the jet range versus orgasm duration (so that jets start out powerful and travel far, gradually losing distance the closer the orgasm gets to the end). These options should also all be kept completely separate / independent from the "Thrusting Speed" slider. "Thrusts Before Orgasm" should probably be redone as "Time Before Orgasm", simply the total number of seconds that continuous physical stimulation needs to be applied until the orgasm begins; since individual pelvic thrust speed and the total number of thrusts don't solely determine orgasm by themselves (every horse has their own very unique preferences for their pelvic thrusting speed and thrust distance to achieve stimulation IRL: some will thrust very fast and shallow several dozen times; others thrust slowly but deeply only a handful of times. Some take only 6 seconds to come, some take well over a minute. Most commonly, once they've found stimulation they enjoy, it will be between 8 and 14 seconds until they orgasm). Also, having the fluid last significantly longer after it's been generated so that it can drip, flow gradually down walls, make puddles, etc. would be awesome. Maybe add unique sounds for the fluid impacts against different materials/surfaces (a wooden stall wall vs a concrete floor vs into a metal bucket vs a glass window vs onto a pile of hay, etc.)?
3. A couple little changes for far more realism: With each pelvic thrust forward, the male's front hooves tend to make a swift, strong "pulling" motion (backward, toward the direction of the tail). When the orgasm starts, all pelvic thrusting and front hoof motion stops completely! Have the tail begin flagging at this time (moving powerfully up and down to the the rhythm of the ejaculation jets: the tail raises up very high just before a jet begins, and then drops completely, moving downward very quickly and powerfully right as each jet happens, as though pushing them out -- think of a firing pin striking a bullet. That's basically what's happening. The male will also be panting VERY strongly, nostrils flaring large and very visibly with each breath out. You can always tell exactly when any horse is having an orgasm: watch the tail)!! If you want to add even more realism beyond that, sometimes one hind leg or the other might raise off the ground and rhythmically gently kick towards or make "pawing" motions at the ground, and / or their hips and abdominal muscles might very visibly convulse / shudder for the full duration as they orgasm (these last two things are somewhat rare occurrences IRL, they are things that CAN and DO happen sometimes; not that necessarily always WILL).
4. The Flare NEEDS 3 size sliders to really be accurate: one for size when relaxed / not erect (nearly the same diameter as the rest of the penis, but just slightly wider; a barely noticeable small bell shape), one for it's diameter when aroused / fully erect (between 2-4x the diameter of the shaft of the erect penis; a large, easily visible, sometimes slightly flat bell shape), and one for during the actual orgasm (during ejaculation the "bell" flattens out significantly or even completely, and the glans -- technical name for the head of the penis -- briefly swells to 5-7x the diameter of the shaft of the erect penis, for a short time the head measures anywhere from 5-8 inches straight across, somewhere between the size of a saucer to a small plate; but it only stays at that size for the full duration of the actual orgasm and then for about 5-10 seconds after). Then it gradually, over the course of 10 seconds or so, regains it's bell shape while also shrinking back down to the large, aroused diameter; and then another 10-20 seconds later, shrinks down again to the original small, flaccid diameter along with the rest of the penis (which then all gradually retracts fully into the sheath, but I understand that's significant extra work to animate).
5. Maybe add more unique body types (breeds) along with extra color choices? So we can make like...Arabians or Friesians or Foxtrotters or Clydesdales, etc. Smaller/young versions of each breed too, so we can recreate Shetland ponies, thoroughbred colts, etc.
6. Having mares and fillies (with customizable options for their genital proportions and orgasms just like the males) for the stallions and colts to mate with would be a very nice addition!
7. Kinda unrelated, technical question/idea: How hard would it be to add text boxes for number input, in addition to using sliders for the customizations (so if we have a specific value or setting in mind we can input it consistently rather than "trying" to get the slider to the same place every time we run the game)? Maybe let us save our customized settings to a file that can be quickly loaded from the pause menu ("Load Preset": you could set up custom scenarios with the sliders or number inputs and then save that file as a named preset to load at any time when you start the game)? That would be a HUGE QoL upgrade!
Note: I do LOVE that the sliders allow us to go both far below and far above what is realistic for each setting. That actually allows for far more variety and realism. Please keep that design philosophy going forward into any future updates, and even lean into it if possible (lower minimums & higher maximums = more variations and closer realism are achievable)!!