I don't think I've ever seen a multiplayer game in a jam ever xD Well done! Sadly most people won't be able to test multiplayer, but the solo game is fun too. I second Lanyard's suggestion about the hold to shoot. I also wished there was something else to do in the other dimension besides picking up health. If you're thinking about continuing this, I'd recommend going for a co-op shooter, something similar to Risk of Rain 2.