I like this game, it's really fun. I just found one little bug, but nothing that could stop me playing. I read the devlog too ^^'
Congratulations on your entry for the gamejam ;)
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It's a little difficult to explain but I will try XD ..
When the box receive jumping abilities, if you're below a platform and jump to it, you can jump so high if you press Space again right after land on the platform. Actually I don't know if this is intentional or it's a bug XD .. But it's a nice game..