use g to restart a level
level 1+2:
Arrow keys to move blue player,
wasd to move red character,
m to interact with objects(blue player),
e to interact with objects(red player),
Push open the door with both players once everythings done,

level 3: 
wasd moves both characters,
arrow keys move both players,

level4:
same rules as level 1,

level 5:
same rules as level 1,
use r for sword( red player),
use l for sword( blue player),
theres a glith where sometimes attack damage doesn't register, in this case restart the level

Dark Suggestion