If you like old-school shooters like quake:
Blood: Fresh Supply
If you like interesting roguelikes and dying a lot
Kenshi(seriously try this one first)
Sundered(didnt like this one but it looks pretty)
Wizard of Legend
If you like Metroid, you owe it to yourself to try AM2R(another metroid remake)
One of the best metroid games made by a fan. Better than most metroid games made by Nintendo lol.