A Super Metroid-like game with wizards and magic and stuff.
So you are the apprentice of a grand wizard, who then turns evil and stuff. With his evil power he constructs a MASSIVE tower that reaches above the clouds. The king then forces you to scale the tower and defeat your former master. The tower is split into different zones that correspond to different generic elemental magics. (Like water, fire, wind, ice, rock, dark, light) In each level, there would be different elemental power-ups that would correspond to that level's theme. Like there would be a wind power that would allow you to double jump, rock power which would let you cling to walls, and light that would give you health boosts. You progress through the game like Super Metroid, you find the ability you need to progress. The graphics would be 2.5-d with lo-fi models in a style like Blockland. I'll probably expand on this later since I've been thinking about this idea a lot.
tl;dr - Super Metroid with wizards and magic and stuff