A full-blown adventure played with only two keys.

Necrosphere is a (really difficult) bite-sized metroidvania game you control
Necrosphere is where you go when you die, regardless of being good or bad. You don’t see other people around there. You don’t have anything to do, except waiting for eternity As soon as Agent Terry Cooper hits the Necrosphere, he learns about the portals that can take him back to the world of the living (also called Normalsphere), and his quest to escape the afterlife is set.
Features
Bonus Level: Terry’s Dream
While inside the Necrosphere, agent Terry Cooper has a lucid dream that removes everything he has gathered so far –– even his clothes.
A few important reminders:

Necrosphere Key Features:
1, Innovative controls: Only two buttons!
2, At least 2.5 hours of tough, NO FILLER gameplay!
3, One big, maze-like universe!
4, Deliciously frustrating!
5, Spandex ballet suit!
6, Collect 5 DVDs to unlock this bonus stage at the Main Screen.
7, Progress is not saved while within Terry’s Dream. Muahahaha…
8, Requires a 64-bit processor and operating system