what day does the update come out?
It's very unclear at the moment since before it was about every 3-5 months until an update came out but if you played this version to the end then you would know that the dev has said that they will rework the game which makes it unknown when a new version will be released. It might be a few months but it might also be something like a year but maybe someone on here knows more.
I cant say i play that many Sandboxes (the only regular one is Power Vacuum which is pretty straigtforward). Can you give some other examples of GOOD sandboxes? Some more fun experiences might be what i need to give the genre another proper go. This game was ok in that regarads IMO simply because it was so full of sex scenes and various girls you could kind of ignore how everything was time gated though admittedly im late to the party... it was probably rougher in the days it lacked anything near this amout of content.
Some fairly good sandbox games on here include. (I'll warn if there is some NTR/swinging in the games since some seem to be really vocal about those parts, though all the games I'm recommending has that part mostly as optional.)
If you like RPG games.
Peasant's quest - involves a lot of breeding but also some beastiality if you pick the uncensored version + a few scenes with swinging or like one scene of NTR if you pick them.
A struggle with Sin - Fairly similar to the game above but does not involve as much around knocking girls up, there are only two pregnancies in the game yet with plenty more to come in the future. It does however involve a lot of NTR or swinging if you choose to go that route though it can all be turned of at the start of the game to completely avoid it.
Corruption of Champions 2 or Trials in tainted space - Very similar games one set in sci-fi and the other set in fantasy they are both text based so if you like to read eroge it's great if not well then their no fun at all really.
(A bit less of sandbox)
Futa Family - Great game if you like futa's and swinging/NTR can also be avoided but it's still hinted to happen in the background.
CataclyZm - Good game if you are into beastwomen since the game is centered around humans + beastfolk, also involves some NTR/swinging if you pick the options.
Warlock and Boobs - Great game that get's updated a lot it does revolve around mostly really big boobs a lot so if your not into that then it might not be that enjoyable.
Non-RPG sandbox games. (I'll just write some shorter comments here since it would take forever if not since you could argue if some of the games are sandbox or not.)
Hail Dicktator - Probably the game with one of the best stories on here my only nitpick would be that the sex scenes could be better.
My new life:Revamp - This game has been going on for years which shows in the amount of content and while some love it or hate it you have to admit it's a pretty good sandbox game on here though it can be very confusing to navigate at first and you might need a walkthrough to get all the content.
A house in the Rift - Also a great game with a great story and cast of characters.
Mist - Great game.
College Daze - Another text based game. Can include some swinging mostly since you can mindcontrol/transform pretty much everyone in the game so if you wanna transform your dad into a bimbo and knock him up or start an orgy in class then go for it.
Divimera - Hasn't gotten that far yet but it looks great so far.
Desert Stalker - Again great premise but not a lot of content yet.
The anomalous Dr Vibes - Whacky but fun game.
Degree's of Lewdity - Basically if there is a fetish out there this game tries to incorporate it.
Lust Epidemic + Treasure of Nadia + The Genesis Order - Same dev and their all the same kind of games though the quality get's better with each one and their released in the order here, though most think Treasure of Nadia is the best one here, LE + ToN are completed and TGO is at 75%.
Lucky Paradox - I haven't gotten around to trying this one out yet but it's supossedly great.
There are many more on here but that should get you some hundred of hours of gameplay if you wanna test them all.