Feature : The <color> argument for dead/alive commands is optional

[Rouux]

If the <color> argument is not provided, the dead/alive command will be applied to the author of the message.
I'm not very good at JS so you might want to change a few things but at least this can give you an idea.

Roux: ,ng
Testing-Bot: Started a new game in Bot testing! Type ,sync to control it through your phone.
Roux: ,join red
Testing-Bot: You joined the game as  red
Roux: ,alive testinRandomWord
Testing-Bot: Invalid color. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,alive red
Testing-Bot: Roux#0472 (red) is not dead. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,alive blue
Testing-Bot: There's no player with the color blue. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,alive
Testing-Bot: Roux#0472 (red) is not dead. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,dead testingRandomWord
Testing-Bot: Invalid color. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,dead blue
Testing-Bot: There's no player with the color blue. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,dead
Testing-Bot: Roux#0472 (red) has been marked as dead.
Roux: ,alive
Testing-Bot: Roux#0472 (red) has been marked as alive.
Roux: ,dead red
Testing-Bot: Roux#0472 (red) has been marked as dead.
Roux: ,dead
Testing-Bot: Roux#0472 (red) is not alive. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,d
Testing-Bot: Roux#0472 (red) is not alive. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,eg
Testing-Bot: Game ended. Start a new one with ,newgame

Roux: ,ng
Testing-Bot: Started a new game in Bot testing! Type ,sync to control it through your phone.
Roux: ,join
Testing-Bot: You need to give me a color. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,join test
Testing-Bot: Invalid color. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,kick
Testing-Bot: You need to give me a color. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
 Roux: ,kick blue
Testing-Bot: There's no player with the color blue. Try one of these: red, blue, green, pink, orange, yellow, black, white, purple, brown, cyan, lime
Roux: ,join red
Testing-Bot: You joined the game as  red
Roux: ,join red
Testing-Bot: You're already in this game. Type ,leave to leave it.

That's how I tested my changes, making sure I didn't break anything on a few commands but you might want to check out by yourself, up to you