So I just tried this game.. And you're telling me theres 6 versions and it's been ongoing updates for 5/6+ years and it has 3 main floors and endings are still alpha testers only? Surely I got the wrong version that was abandoned early right?. If that's the amount of content then this is just silly.
There's a pretty reasonable amount of content for the team they have, and the manner in which the game has been developed. Allow me to explain:
1. The game is modular, and you can remove entire game mechanics from your playthrough and still have it be balanced and functional, because not everybody wants diaper-play and scat mechanics in their game. Or inflation. Or milking. Or even cumplay. Although if you remove everything at once the game starts to feel a bit empty, to be fair.
2. There are four major areas that have been developed and they all are filled with their own "interactions" and scripted events that you can play with, that don't boil down to turn-based combat and on-off switches. The class system in the game has several unique interactions that also play around with Trap Quest's environment and the monsters inside.
3. The focus of the game hasn't been "Put as much basic stuff in as possible for the player to dredge through level by level" but rather on designing an engaging gameplay experience that keeps things moving within the same areas of the game, making playing in the same part of the same level feel different as time progresses.
4. The "versions" you're talking about are only dealt with by the graphics designers, and are independent of Aika's programming and design, which is the main flesh of the game. If you're talking about a lack of content in visual porn, then that's not Aika's fault, it's down to whoever made the particular character window, some of which are no longer in development.
5. Right now as far as I can tell the majority of new content being made is focused around the "slut school" area which really focuses on putting the player through a large variety of scenarios, that gradually escalate in their severity or sex themes the further in you go. If you aren't messing around with the "Extra Credit" or slut school scenarios then you won't be seeing what must be more than a year of work into what is now probably one of the more fleshed out parts of the game
I could say even more, like how the levels themselves begin to change depending on certain events you can discover in the game, or how Aika is constantly wrestling with balancing mechanics between every possible level of fetish activation, or how adding in new clothes, curses, and interactions all involve coding in entirely new mechanics to the game, which they have done repeatedly over time.
This isn't like one of your typical CYOA twine games where you grind out time until your character is a depraved enough slut to see a linear set of scenes, there's a system in place for sex, arousal, addiction, "rape", etc etc that all have to have rules built around them, so if you alter one of the elements of the scene in becomes a different looking interaction. Trap Quest has more content than most games of it's genre.