Loved this game. It was simple to get to grips with, surprisingly addictive, and thoroughly enjoyable to progress through. The upgrade system was excellent!
The only things I would have liked to see is visual indicators for both confirming that I was hitting a tower, as it was hard to tell, and an indicator of where the next turret was going to spawn, because I was surprised by a sudden turret appearing on me and ending my run a couple of times.
Brilliant game, 8/10 would fist again.