ok, needs work
Pros:
1. Graphics
2. Powerups
3. Layout of elements
4. Enemies
Cons:
1. No sound or music
2. With no other ways of firing the gun, eventually the player's mouse hand is going to get too tired to keep playing/carpal tunnel
3. Too hard- I would prefer a game with levels and an ending
4. Some distracting moving elements on the game screen make it hard to tell if it's enemy fire or just benign background graphics