– skirmish: single player mode where player is spawned once on the map. Point is survive as much time as possible or as many waves as possible. Ofc number of enemies and overall dificulity growing over time.
Because multiplayer may not always be possible and moba scheme may get moring after time. There could be also some kind of online ranking so even single player mode could be competitive.
– survival mode: Multiplayer mode where players are thrown on large area and last man/team standing win. Last times very popular mode in games like Fortnite or PUBG.