The rules are very simple: kill enemies, jump on platforms, collect money and experience. Experience will allow you to pump LVL. Each level you will be able to choose a weapon/skill. In total, you can collect up to 5 skills. Each skill will constantly attack enemies, you just have to not fall into the abyss and not let the alien get too close. This game combines different genres: Platformer, Shoot 'em up, Roguelike and even RPG.