A wonderful twist on the usual tower-defence rules (and on the game theme also)
Only real nitpick would be not seeing turret range before placing I guess; not realising I could upgrade them was more on me being unobservant.
(also had an odd bug later where it kept sending multiple waves at once. But think that's my fault for spamming the next-wave button to much to throw the run on that stage
EDIT: seems to trigger when speeding up on the last stage. Came back and beat it this time~ )