Shoot enemies and earn money to upgrade your weapons with the non-linear upgrade system. Enjoy the 6 free worlds that each contain 45 levels over 5 different game modes.
Controls:
Move: WASD or Arrow Keys
Aim: Mouse
Shoot: Left Mouse Button
Special Weapon: Spacebar
Change Weapon: Shift or Q
Pause: Esc or P
Find DiffANIMALerence 
Supercar Bold Ride 
School Bus License 
FlapCat Christmas 
Daily Battleship Solitaire 
China Mahjong 
Splendid Fruits Mahjong 
Grand Prix Hero 
Flying Saucer Attack! 
Fashion Studio – Skater Girl 
Don’t touch the red 
Paper Cannon 3 
Carry On 
Floats 
Cquence 
Ghost Ops Shooter 
Daily Calcudoku 
Pyramid Adventures 
Halloween Crush Party 
Winter Mousse Cake 
No Mutants Allowed 
Movie Star Assistant 
Zombie Head Venus 
Rapid Math 
Massive Defense 3 
KULI 
EvilWyrm 
Lost Island 3 
Aston Martin Vantage Puzzle 
Cooking Mahjong 
Adventure Time Ping Pong 
Egypt Mahjong – Triple Dimensions