You are in a dungeon and you don't know why . GET OUT ! .
The goal of the game is very simple , there are 21 rooms that you can go to in no particular order . There is a crystal in every room that you most collect , collect all 21  to activate an elevator that will (maybe) take you out of the dungeon .
This is a platformer but you can actually walk around in all 4 directions . There is no enemies , just walking , jumping and collecting crystals . Sound but no music.

My Minimal Competition entry.

Features minimal story : just one line at the beginning and one at the end .

Minimal controls : arrow keys and SPACE .

Minimal gameplay ? : just walk and jump .

Minimal overall : Yeah ! Minimal !