This is a cool idea, makes for fun gameplay! I think it could use some tweaking though. My main suggestions would be to either have some look ahead on the camera, or some sort of indicator of where enemies are relative to you. It was a little hard to tell where enemies were coming from and I often found myself running directly into them because I didn't have a enough time to respond once they appeared in my field of view. It might also be fun to spawn more vending machines as the game progresses, instead of having to go back to the same places to get the coin and soda. I also think there is some sort of issue with the camera and/or the player jittering while moving, but it's not a big deal, bugs are expected in jams :)

Nice work :)