My favorite of your games yet. All of the pressure of rushing and multitasking to get a good score being put towards a bonus instead of how you did overall is a very much welcomed change for me. I get to enjoy the game for what it is instead of having to worry about rushing everything. 5/5.
Visually astounding. Gameplay wise, not soo much. The angles that you have to assume you're shooting on kill what the actual purpose of the game is intended to be, unless of course it was intended to be a movie, in which case you nailed it.
Creep priority is pretty much a necessity in tower defense games, this is purely chaos and loses a lot of the fun appear when half of your strategy in a strategy based game gets thrown out the window.
Very fun and having a cooldown for towers instead of a cost is really refreshing. Being active in a tower defense as a playable character is always fun too. However I didn't once get below 90% health, a difficulty option wouldn't hurt.
Also, to get the achievement to unlock you just have to beat the game and then idle on the main screen that it brings you to for about 1-2 minutes. Mine unlocked after awhile.