Really cool game! Like the overall concept and the upgrades were quite interesting. Feedback: Definitely needed more polish(sfx, screen shake, particles, etc.). I liked the upgrades but the game got boring after 1 or 2 runs and was fairly easy. I would've liked it better if got coins for every wave u finished and and upgrade panel showed up every wave. Would've made it more interesting and strategic. However really cool game and can't wait to see more :D