Good evening Fat Cat Games, we tried your game and we think that the concept is simple and brilliant.
The projectile is well paced and the movement of the gun is very smooth.
The major downside of the game is the reloading and the game loop itself. It reduce all the game in a wait to have the gun refilled. Probably an ammo spawn and a life bar for the player would help the player in play in a more intelligent and efficient way
In the complex it is a quite good game, well done