Very interesting game. It's pretty similar to BTD and judging by the name of the game itself, I guess you were inspired by those games as well. So yes, this may not be the most innovative, but it is definitely a lot of fun!
First, the main menu and moving the box to start the game is a really nice and clever idea. Now, of course this game is inspired by BTD, but it's still a lot of fun nonetheless. I like the idea of a 3D version of that game where you have to move around and place defenses by yourself. Also, you can move the defenses (and you also have to reload them) during the waves. That may seem like slightly cheating, but to me it makes it a bit easier and also more fun, and you won't just immediately fail if you mess up the position. But again, as you have to earn a lot of money just to build a single turret thingy and that you have to place it manually, it becomes a lot more chaotic. And that's how this fits the theme as well.
There are some things that you may have to improve, so for example the 3d placing turrets idea is an incredible idea, but the way you have to position yourself just right makes it slightly annoying and harder (especially if you're like me and you want to place everything at the exact right spot). The visuals are also nice but it would be better with some polish.
Again overall though, this is a really nice game! (Also sorry for the long comment...and also I said that i would rate this game a few days ago but forgot, sorry xD)