I completed the game, couldn't open the door at the end, had found 3 frogs and now wonder if I needed more of it's simply the single ending, it's fine either way. Given the context I expected the game to be shorter and was pleasantly surprised.
The controls don't always feel perfect, like there can be weird behaviours where walking on a plateform above a ladder, a few times I wondered if I went out of the bonds of the game, don't get me wrong they're fine and the game is quite stable.
The game is very cool. It's absolutely gorgeous and the animation of anything's animated is great. It's quite atmospheric with appropriate, cryptic music, I enjoyed when the joyful music started near the end, and the last ladder sequence was a satisfying conclusion. There are quite some cool sequences especially during the late parts, the checkpoints are rightly placed and if the game isn't hard it's still easy enough to die that it's quite fun to play.
Thanks for sharing the game.