A fairly complex but ultimately forgiving escape game. It's a fun challenge which utilizes transformation as the main puzzle mechanism, requiring AP/AR by a variety of limited means. The game is difficult enough to force the player to be conservative with the age changes and other resources, but it is not punishing. I had missed one important item by the end of my playthrough, but there was just barely enough flexibility that I was able to backtrack and still achieve the best ending. One caveat: the submerged cave involves some extremely poor game design with unprompted false walls. I had to check the forums for that tidbit and likely never would have figured it out on my own.
There was not much characterization for either the MC or NPCs. With this in mind, the immediate and mandatory TG early on makes the MC's original sex seem rather meaningless. This theme was continued in the bad ends, without much more than a few sentences of elaboration for any of them. There are plenty of opportunities to transform NPCs, but most of these are functionally bad ends and suffer from the same brevity.
With that negativity out of the way, I'd still recommend the game. It stands on its own as a game first, while still managing to serve as a vehicle for fetish content.
The window this game uses it tiny, which means that it's difficult to impossible to actually see the different transformations.
Combine that with the incredibly obnoxious music and the fact that endings are just "you turned into X" and I found little reason to play it long enough to actually beat it.
You're not gonna win this in one go. This game is mostly trial and error, and then restarting with some given foresight from the last playthrough. It's a good puzzle, though.
This game is hard! But true to the retro japanese games, they have a lot of puzzles that requires you to actually plan ahead before attempting a puzzle. Kudos to the translator for translating everything including the omake!