Good base. Bad execution.
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Pros
Properly aniamted, the character has carisma despite being a turquoise square with legs. the eyes are woobly enought to give a cartoony dynamic effect. the legs look as fluid as the movement and feels good to control it.
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Cons
Is not a game proper for a Jam. specially becouse the attention spam of players is usually very short. Not to talk bad about players but more for the amount of games uploaded to the page. with means your game can't get the proper time of its gameplay unless you give them a reason to hook into it.
By example, the game punish badly for every slip yet there is no truly a reason for the player to continue it. So it makes the game very easy to drop for the common passing player. If the game added a clear goal from the start that would be an improvement.
Also take by example the gameplay here in the comment section. The person recording didn't even reach to see the phone animation
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Wasted assets. You could recycle and optimize much better what you did. By example you made a nice animated tree at the start yet until were I reached never saw it again. You could repeat it. turn it arround even streach it or shrunk it to vary and it would look nice as long you did modify it in a smaller way that wouldn't mess the quality. Or other example. your background is way to simple. you could draw another parallax at diferent motion speed for some depth. Or even re-use the one you already have with a copy at diferent speed. As I said. good base, bad execution
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Technical view: The jump sound starts everytime when I press W even while in air and not jumping. Also try adding a pitch variation to repetitive sounds. you could fix it adding a "Randomfloatinrange(X1,X2)" in the pitch sound configuration. It makes repetitive sounds be diferent at every use.
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How to make it better?: Add some zones that allow player to actually save or some kind of check points. PLayers would be more eager to try hard things as long the previous effort is not just being trow away.
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Random: At the first I thought it was just a concidense the fact that the song sounds....WAAAY TOOOO..similar to certain anime ending. Them I saw your name and realiced it was no coincidense.
I already know the anime, bruh, that is how Im able to tell it sounds similar bruuuuuuuuuuuuuuuuuuuuuuuuuuh