Hi,
For the recent #AGJam I've made an Audiogame First Person Shooter Multiplayer Online : a sort of "simplification" (but not yet easy lol) of FPS for blind (or curious) players.
The key feature is mastering the radar thats works like that
CONTROLS
Arrows up/down : move forward/backward
Arrows left/right : turn left/right
Space : shoot! Kill or be killed
Q : Game stats
E : Use the foundamental radar, the first check forward left, the second the front area and the third the front right area. You will notice when the radar found an enemy
R : Reload, you don't have infinite ammo
T : Speak, because is fun
You will play in room of 4 player or vs a frienldy BOT
Here a gameplay example
You can test the prototype here http://gamejolt.com/games/blind-arena-tournament/183539