Interesting concept. The cute drawings, chill music, and funny plot are lovely.
I think the red button section has a bug, not sure. After the bar got depleted for so long, I can't charge it anymore.
The way we can display all puzzle and almost cover the whole scene feels like a cheat - it makes everything easier. Because we don't have to wait for ! mark to appear, we can focus our attention to all shown puzzles if it needs to be solved again.
Overall, you did a great work on making the game, it is polished and it looks really cute.