you could make a vr mode
add more guns
have a pause mode (from the main game)
have a way to place wall easer (ie a hologram placement)
have a way to mod this mod (to increase the content or custom content)
fix the face towards player button on the C menu
MUILTIPLAYER?!?!?!?!?!?!? (this would be insanely cool and hard to make)
buttons you can press
enarmys that can fight back
player damage and when death happends the player respawns
invotory
more maps / a map creator by the comunity