Press green flag to start then shoot the science monsters coming towards you. You will shoot with bullets. Once you run out of bullets you answer questions to get more. These science creatures will drop money called credits. Use these credits to buy skins in the shop. I haven't tested it but if you die too much and keep doing restart on the death it may get laggy.
I made this for my science class. It took a while but I will be updating the game and questions a lot. if there is any bugs or you want an update tell me.there is a new skin, Jorge. Have Fun :)