Played through this co-op with myself on keyboard and a friend on game-pad. The game feels so so smooth, its surprising its made by a small team! We were so disappointed when itt ended and we realised there were no more levels.
The only feedback I would have is to make "Medium" difficulty easier as there is currently a MASSIVE jump between easy and medium. Also maybe more variety in the upgrades for the shop.
We eagerly await your next update!!