Firstly: I'm slightly colour-deficient and I found it very difficult to locate the reticle, then to keep track of it throughout the game. I also thought that a slight grace period of invulnerability or something when you switch characters would be good, maybe combined with some kind of full-screen effect announcing the change.
Nitpicks/accessibility issues aside, I thought this was a pretty neat idea that could be really good fun with a little more polish. Well done on getting it submitted in 48 hours, and good luck on future projects!