The game has the player pass through randome levels and try to get a high enough score before you die and you also get rewards surviving long enough. 

instructions: Space is to shoot bullets that your player , use they keyboard left , right and up to move the player and you can double jump in the game. 

follow the arrows that leads you to the next levels. 

to aquire the rewards you have to last for 15 seconds on the moving platforms & to gain more health you have to kill at least 2 enemies.