Thanks for playing and persevering through the initial obscurity. In the end you were playing the game really well! The punch (that happens when you try to shoot without points) is for breaking the blocks. I really also should have put the air jumping in the "instructions". I think because I saw this version so much as a WIP thing I was (subconsciously) reluctant to put time into guiding new players.
(The current music is great but gets quite repetitive soon so that's why also the 'H' mute button is useful :))
The feedback about the harshness of exploding when going over the limit was interesting. I like how getting full can suddenly turn the area super oppressive and dangerous. But I probably will try to think some ways to soften that. Tom Francis wrote on his blog sometime how a wider spectrum of failure is usually better than a binary success/fail.