Wow this was short, simple and really sweet!
It took me a couple seconds to figure out what was going on, though that was mostly because I didn't click in the window properly at first.
I like the visuals and sound effects, and the gameplay itself despite only having 3 inputs and not even really an enemy is surprisingly engaging.
I also like how the health bar is the trumpet keys being pressed down!
I only ever managed a high score of 10 so I'm not that good at it, but I really don't have many notes. A high score leaderboard as someone else mentioned might be nice, but it doesn't feel sorely lacking without one.
This was nice, great work!