A pretty good challenging platformer,
although the movement is really slippery, the one block platforms don't help either.
Pressing jump and not jumping happened to me way too many times on this game, maybe add a coyote time?
I couldn't pass level 3 because of this, I just kept dying over and over because of these problems.
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A minor opinion I have is…
Sometimes it feels like you can see a lot of tiles on the screen but a very few ones that you can walk on.
Not to mention that most of them are just flying in the air.
I mean, the old man said I would see some stuff that aren't real, but I think this guy just straight up sees a completely different place sometimes.
This is a very minor thing, however, it is fine if you don't agree with my point.
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Other than that, very well-made!
Good luck with your future work and welcome to the community!