Very fun idea!
But here are a few things to consider post jam:
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After reaching max jump height, apply more downward force so it doesn’t feel floaty.
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The game scene looks a bit plain—adding more colors and visual variety would help.
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Instead of just showing a percentage, try adding an animation to indicate charging the jump.
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Add a small shadow (like a black circle) under the player to make it clearer where you’re falling—similar to Crash Bandicoot.