I like the take on the TD format where you make the waves.
I wasn't a 100% sure exactly how buying and releasing works. I think the shop increased your count and then the button releases them? I was only able to get a couple units to the end, but I think I was out of money at that point.
The 3D work is excellent, and it looks great. I would've like the ability to rotate the world as well so it looked less static.
Solid entry. Well done.