Interesting take on destroying the package deliverers. The visuals are great and sound is initially great but having 8+ turrets firing at the same time became overwhelming. I also like the varying enemy types and turrets. 

Once you place 2 $80 turrets, you are basically good for 30+ waves having consistent income and putting only $300 turrets. I got to wave 35 I believe, and they couldn't even get past the first turn.

A quick fix to make it harder could have been to allow multiple waves at the same time, just to see what kind of chaos transpires when you have a full field of turrets and enemies.

I think the game is too easy, but i understand that it should be really hard to find time to balance and test the game in 3h only.

I enjoyed the game, the visuals were good and the gameplay was simple, but interesting. I managed to get to wave 40:

Nice tower defense game, and neat take on the theme. I am not accustomed to played many tower defense games, so I am unsure whether my score of 9 waves is good (it was my second attempt, 8 on the first). I really enjoyed it and definitely has got my thinking of having a go at making a tower defense in the future. Nice job.