Nice twist for a tower defense game! It reminds me of dungeon defender in a way that the player was directly on the game scene. And being the bullet itself too is very interesting. Sad that I can't be at more than one place at once as something needing to stand there to do something seems like a bit harsh. Or maybe just make the player character move quicker, I don' know. Also, please let me remove turrets, putting in a wrong turret it's stuck there forever sucks.
I see the game is in a very early stage but there is definitely potentials. Keep on the good work!