Pretty solid even if it gets quite overwhelming at 100+ combos.
I think I may be a dumdum for not figuring out how to use Shift correctly for a good while, so my first tries were filled with dread lol. Even when I figured out how to laser, I really couldn't get above 110+ combos because I've got poor multitasking skills, and this side-dodge trick the heads do at 100+ combos is nasty (for me).
I think the biggest negative is that the moment you lose one of the heads, the game becomes immediately a bit more too easy. And when you're with only 2 or one head left, well the game becomes boring, it's more like the flow of the game grinds to a halt rather than feeling like all the stakes are on that lone head. (Maaaybe, you could counter-act this by having the dark heads still go down all lanes, and if there are heads to shoot in an unattended lane, the nearest friendly head moves to the lane to shoot? I don't know)
What else... Hmmm, good graphics, good sountrack. I featured it in my video about the Game Jam!