Story : Joe just has some Space ship problem and must land in a an ancient planet with it's own dangers and history. he will have to find energy and components for his ship to be able to travel back to his home land.
Main features : Metroid like style game with some puzzles , gameplay specific to some level parts. Abilities and upgrades plus bosses. Secondary quests and bonuses , hard level mode.
The main ideas are great environments discovery pleasure, progressive gameplay mastering and reward.