Super-Interesting! Most unique (and funnest) concept I've seen! I got the ALTF4 and pressed it before I had time to think, haha. The graphics and music are also amazing!
I think it's a little undemanding/repetitive at the start. If there were some very moving slow, but just a lot of them, it could be a better difficulty ramp?
It also took me a second to understand what the game wanted me to do, because the buttons aren't very clear when they light up on screen.
REALLY well done though!