Ideas for co-op mode

[S rank | YT]

there are not many ideas, so I will be brief.

1. The rebirth of an ally in the elevator.
2. The compass on which the players should be shown.
3. anti-cheat, well, it's clear why and it's easy to make it a plus :).
4. ONLINE co-op is not like in Sonic Superstars, otherwise we know such developers.

these are all the ideas I had because it's for co-op mode, but if the author wants to make a mode where players swap places with monsters, then everything will depend on him.