Felt like I had to play this one since our game is called almost the same thing, haha :)
Kudos on going the 3d route! Haven't seen too many of those. Like the concept, though I didn't see the tower on the map for most of my first playthrough, so you may want to make sure things like that stand out better (and maybe call out the WASD keys on the map as well just to make sure the player doesn't forget in the rush of shooting).
I love that you go all sorts of different creatures in with simple animations and that you got sounds and music in as well, it makes a big difference. In future games like this you should be sure to give some sort of time survived or enemy score so you can compare how you did with previous runs.