A little difficult. But it's interesting that each stage has a different concept.
One really small point.
In the first stage, the player collects keys.
However, keys are usually one-to-one correspondence. It looks like a very important item in terms of representation.
In the game, it doesn't matter which key you collect, as long as you collect 10 of them anyway, but the key seems a bit exaggerated for that motif.