I think there's a couple of things worthy of consideration in order to tackle the issue of expanding the game's fanbase.
In the first place, we have to acknowledge that a lot of people have provably already seen the game a couple of times in the LATEST UPDATES tab and quite often in the Latest posts/replies sections - the thread has been visited over 760K times (I don't know how many of them were unique users vs repeating ones). Of those not returning, they either didn't try the game because what they saw on the first post and/or thread didn't catch their attention or they tried it but didn't enjoy it.
Improving the renders of the first chapters may help retaining more users, since the first impression of a game is extremely important and nowadays most people expect very high quality visuals (or specific styles, but this doesn't apply here). But, to be honest, I think that if somebody didn't like the game it was mostly a matter of personal tastes, the amount of existing content at that moment or the game's rhythm rather than the quality of the renders. And that's OK, because, as an artist, you can't try to cater to everybody - it's impossible to do so and most times counterproductive to even try.
What I think you should really focus on is the first group: people who didn't actually try the game. So it's about marketing: without changing or compromising the game's tone or narrative in any manner, selling it in a way that it's more attractive to the typical adult game player (that can enjoy a narrative-driven game and/or fap to something other than a very specific fetish).
Once you have the new renders finished, I'd contemplate doing the following:
- While keeping true to Heavy Five's sprit, change the banner into something more eye-catching and sexual. Your game is surrounded by banners of other games with striking colors and suggestive images, you are competing with them for user's attention.
- Stress that you just released a remastered version of the first chapters with significant improvements. People who have already given a pass on the game without trying it may need an excuse to reconsider it again.
- In the description of the game, explicitly describe a couple of situations the player will find themselves in (such as having to land a failing spaceship with all odds against) or how the player has several different options to approach the same girl (Sarah and Chris are good examples). A video-game is an interactive experience, players like being aware of what they will be able to do.
- In the screenshot section, feature a good-looking render of each main girl in an evocative situation (personality and relationship-wise), a couple of general action frames and a couple of x-rated scenes. Avoid repeating too much of the same background (specially claustrophobic ones) and try to break colors in their order sequence.
- If it's not too much work and you don't feel too bad about it, consider presenting Becca in an even more sexualized hostess way (fetishistic costumes, sensual talk, an ongoing masturbation sketch, etc.). Sadly, a lot of people need sexual content from the get go and the tutorial and interludes could be used to satiate them a bit until everything unfolds.
Cheeky bonus track: add the "incest" and "ntr" tags to the fetish list. Make sure to add OPTIONAL before the second.
