Endorlight is rogue-like game in which you have to find a way out to the next level. 
Most importantly - you need to survive. There is no "Repeat". When you die, you have to start from the beginning. 
Each level contains a new and tougher enemies. Every 5 levels there is a boss to so sed your axe, bow or whip to defeat them! 
When you defeat a boss opens the door to new biomes. But remember that every boss is different, have more live and takes more lives per attack!