How to play?

Hit spacebar to fire at circle rocks and wide + as enemy that shoot at you. Shoot the rocks and bullets as you can to protect your ground. Also you shoot at wide + on top of the screen and it will disappear so it can't shoot at your ground for 30 seconds. If rocks and bullets hit the ground, the HP level will go down as ground is damaged. Watch for yellow star, catch it and you recover your ground to full HP. Make sure you hit F11 for full screen and scroll down/up with you mouse wheel wjhere you can see the game you can play.