Cool game you got there! Its very easy to pickup and play, whcih is always a a good sign in my book. I did not find the game particularly challenging and there appears to be little incentive to attack anything but the enemy torso.
As for the main mechanics, honestly pretty solid, especially enjoyed your solution for the theme. I was always calling up my dice roll to see if I could grow or shrink anything and it was great. Used the dice roll on the enemies to make their weapons slow while also bugging may weapon!