Grats on your submission! It reminds me a bit of trying to control mice in Chu Chu Rocket...
It is a little tricky to move fast enough sometimes, and it might be nice to have more of a tutorial for how the heart moves.

I think it'd also be great if you auto-respawned without going to the all-red respawn theme, especially on harder levels.

The lighting effects are neat though I am not sure if they fit with the game's art style.