I really like the atmosphere of your game!
The graphics are gorgeous, and together with the music, it's amazing.
The animations of the character feel lively and the movement is great. It's responsive but doesn't feel too stiff.
The main mechanic of the game fits the theme well and has a lot of potential. It also reminds of the rewind gun we used in our game. There's a lot that you can do with that idea, and you did some things. I didn't finish the game, but what I saw was interesting. If you pace the game like a platformer, where each level is about an idea, like those platforms, or falling rocks, or platforms on water, I could really see a great platformer here.
My only real complaint, as others pointed out, is the lack of checkpoints. If a game gets too frustrating the player will quit, and so did I. Maybe you could do a bit more with the levels. Like adding a tutorial or refining the level design. I haven't done much platformer design, so I can't really tell. I have a feeling that you could at least smooth out the difficulty curve and put your ideas into levels, which then could focus on an idea, such as a theme or mechanic.
Great job! You could develop this into a full-fledged game, but it's going to be a lot of work. So good luck with your game dev journey!