Nice visuals.
On my first run i collected all flowers. Not apparent it damaged me until dead.
On my second run i collected the big square and crashed the game :p
Not sure if intended or a technical issue, but the timing is off. You get punished for being too on beat and has to practice to delay your actions, which does not make sense for me. Would probably give a nicer feel if the window is like 0.0s-0.3s, instead of 0.3s-0.6s or whatever you got set up.