This is a really neat tower defense! I really like that the enemies target you back! It helps keep the game from turning into an idle game once you get the towers in the right spots.
The random tower placement areas was also a neat touch! Helps make each run feel a little different, while still using the same map. Best round I had, I had 3 placement spots right by the start of the road, so I was able to whack them right as they came out the gate!
Great job overall! The art and UI were super clean as well. Well done!