Played this after you left some feedback on my game. This is really cool! It gets very chaotic very quickly, and I love the fact that you have to manually collect resources from the dead enemies rather than just sitting out of the way. I could have done with some more information about when/what the tower will attack (I wasn't sure if the lock-on tower had a range, for example), and I also thought that a lot of the shop options were greyed out when in fact they were just grey anyway. Wonderful presentation though, and I think the idea is well-executed overall.