I really like the concept and approach here. The music is very cool and makes the whole experience feel smart and smooth. The only thing I find a bit annoying here is that I can still get hurt even when I am not absolutely still. So maybe not make the player immediately vulnerable after stopping, instead, give them a little breathing space. Otherwise, I get hurt even when I am constant smashing the keyboard and flying around the screen.
After all, love what you have done here.