Nice one. I really like the multitasking aspect. It wasn't immediately clear what I was supposed to do but I worked it out after a few deaths :)

If the visuals were more appealing, it could be a banger of a game!

WOW. Without an explanation page, it took me a second to figure out why I was consistently failing despite dodging the red blocks. This game is so good! I've never seen anything quite like it. It is an interesting, innovative take on the theme that I played for far longer than I should have! Great job!

It's a really engaging and elegant game, and well-suited to the theme!  It would be fun to extend it by adding more movement options (jump, duck, 4-dir movement, etc.) to the left, and more complex mouse movements (ex., rhythm games) to the right.  

It's really addictive; great job!