It's pretty aight. It kept me engrossed for 50 waves or something.
But, the tutorial intro sequence made me want to skip, until I realized they might have been talking about how the game worked.
The popups were also very intrusive. My one take is to build the game without having a strong tutorial in mind,
I feel like for your game, I could have figured out all the mechanics if you just threw me in with the 3 basic controls. Didn't need all the flashy UI and such. Although it looks pretty cool, it was in the way.