Wow... Great art and atmosphere. Some great shooting mechanics and upgrade system here.
I had some fun... But not in the way you meant to :)
Did you know, what you can bring your gun cooldown to negative number? And after that you can shoot only once in a day? And when cooldown is zero it shows -0 and have the same effect as negative number?
Did you know, what you can repeat level even after game over screen and survive the wave even when your hp is below zero?
Did you know what cost for Gun Cooldown is 25 but label says 20?
DId you know after day 30 or something with 0.01 reload speed I'm still dying?
Fun little gem! Love it :)