Ok, wow, I'm ridiculously impressed by what you managed to cram into only two and a half hours of dev time! Love the concept, detonating the boxes is extremely satisfying. A tiny change in my opinion would be to make the player movement a little bit faster, but it's only really something that impacts some of the later larger levels.
As a fellow user of Godot, I'm intriguied - what does your gamejam template consist of?