This is a casual shooter game. There are 2 game modes:
1) Wall moving mode: you need to move the wall towards the enemy by shooting it. Enemy can shoot too. Use colored circles to increase the count of bullets. Bullets can also ricochet
2) Run'N'Shoot mode: just run and shoot all the enemies before they shoot you. Use colored circles to increase the count of bullets. Shoot at the nearby objects to push them towards enemy
The main goal is to go to the finish alive and shoot the main level enemy.