What did this game do well? (Answer in a few sentences)

• I think you did a nice job with your game! Its very clean and I like the sprites you used. Its simple, but also a fun concept.
• This game was a hoot (a real fun time). It brought me back to many a glorious hour sunken playing Bloons Tower Defense online. Great inversion of the usual tower defense mechanic, with a morbid/funny metaphor behind it. I found myself stacking towers in the center of the board and spamming an optimal stream of enemies, to pretty hilarious and chaotic effect. Very satisfying to wipe out the horde in large numbers.
• The game add some new design to the typical tower defense game.
• Good game design. Tower defense is a very good game type for skill depth. 

What could be done better? (Answer in a few sentences)

• I think it would be cool if you could upgrade your existing turrets or if perhaps add different types of enemies.
• A greater variety of towers and enemy types would add depth and replay value. I also found my hand getting sore (probably as a result of the playstyle I adopted), which left me wishing there were sliders for controlling the intensity of the flow of enemies, which would allow me to spam-click a bit less and be more precise in my strategy. 
• Adding more types of weapons and enemies. Also make better user interface letting the player know how the score is going on.
• There was a bug, the Tower may not attack the enemy.

Instead of clicking the path to spawn enemy, Maybe use resource system and auto spawn enemy with time will be better.