You can add:crewmate do task and the impostor have a time for win.
Bigger map
The player can be the crewmate : the bot impostor wait no crewmate in 5 meter and kill, use random vent. I know it will be difficult, but you can try.
I have made a game I can help you with sound
Chat:bots write the color of the impostor.
This is only some tips... For now a very good work