Well the game play is very easy,
- Keep Press space butto to move gu upside.

Your job is to flip the gun to move up endlessly. Before you run out of bullets you have to collect bullets and coins. If you want to unlock more guns then you must collect more and more coins.

For iOS:
Safari on iOS 8 and later supports WebGL 1.0, and on iOS 15 and later supports WebGL 2.0.

For Android：
Nearly all of them support WebGL