Not sure about splitting my brain in two but you definitely got me going cross-eyed! Haha.
This is well executed and the game feel is on point! The death sound effects certainly make you jump (in a good way) when you're concentrating on one side of the screen. Good use of particles too.
I think you could improve the game by adding a second twist to this base concept. I feel like after a while the player gets used to the 2 side mechanic. Adding something else after a few levels would be a pleasant surprise.
Well done! :)