Rating issues
Violence is very mild, with opponents disappearing or respawning on defeat. No blood or injuries are shown in the levels. However, there is an intro movie that briefly features an older woman lying at the bottom of a staircase, in a puddle of blood, with the playable characters standing over her. Younger children may find this scene upsetting.
Other issues
The game features online playing capability which may involve real-time interaction with other players.