1) I agree with your opinion.
By the way, I liked the levels more in part 1, except for the harassment on the train where you can’t give tasks and cyberspace.
But...
2) Since in 1 game the author gave it his all, and in fact this 1 game did all the existing analogues, and still does, but only in 90% of the parameters, and not in 98% as it was before.
Then the author simply ran out of ideas, since almost all analogues copy his work and the game went along the path of evolutionary changes, which, in the context of accelerating technological progress, is extremely little noticeable to a modern gamer.
A little more mechanics, for example, the cancellation of the transformation and the enemies removing the rings on the nipples, and the nipples themselves also block the milk.
The drawing has also improved significantly, and the slimes have become transparent.
5 levels instead of 4, a more advanced system of traps (I'm not talking about ambushes).
The RPG maker engine has become obsolete and simply does not pull this game.
3) The next game will also be 2 times better, but again, the changes will be little noticeable.
We are promised: a new rpg maker engine, slightly improved mechanics, which will essentially affect the speed of the game and the number of bugs, 2 heroines, voice acting, translation into other languages.
The RPG maker engine has become obsolete, I think only 4 or 5 games will be really normal. Mind you, 3 is not out yet.