A simple yet fun game that has been well polish, the art is great, the animations and particle effects as well as the graphics are amazing, the powerups and upgrades as well as different types of enemies helps bring more content so it encourage players to play more(although why not make more shooting style a shotgun or a submachine gun as an upgrade or powerup?), the sound effects was good but I would like some music while playing, I was thinking of an enemy that has an area denial kind of effects like an enemy that fires in all directions or one that drains a players health while near it, or an enemy that fire green projectiles that heals whoever it touches both player and enemies, or a grenade launcher type enemy.
Awesome game good job :D!