Really neat game idea! Shooting enemies felt really satisfying, and I think the game has a lot of potential.
Obviously, it's a game jam, but at a point the gameplay just becomes move left and shoot the whole time, without using your teammates, which kind of defeats the purpose of the mechanic.
I also think some camera shake, and a more interesting map would do this game really well.
The art and audio was really nice and minimalistic, and I didn't notice any bugs, so great job with that :)
I'm also curious how you made the level infinite (if you did of course, maybe I just didn't reach the end ever)
Really nice job!