Not a bad horde shooter - I feel like the enemy AI could've done with some work to make them feel better, what with them just beelining over rock obstacles for the player, meaning you essentially are unable to kite or strategically buy yourself the space to breathe that a lot of horde shooters benefit from having.
But for a game made in seven days, this is pretty good. The animations feel good for the main weapon, and the general game loop is a neat one.
I'd maybe have integrated the wheel into the environment somehow - have the player physically go up and maybe shoot it to spin it, instead of a UI popup, to really make it pop. CoD: Zombies shined because of the mystery box, and the uncertainty of what you'll get, coupled with seeing all the options tick by. Having it physically in the space also works - it brings the player in, and makes them have to think their approach through.
Sounds do need a bit of work too - and with the right work I could see this making a really fun little co-op wave defense game that harkens back to the old school shooters of the 360 era.