My thoughts exactly. For this game we'd need things to make it more interesting,
@Aimee2323 already had an idea of mobs attacking, and the kits are also pretty cool, but it needs more. Maybe there could be some traps set around the map/arena that the players might want to avoid, but there could also be places inside those maps which could give you a slight advantage, e.g. a power up or a better weapon/armour. I would go with the armour or weapon, since parkour mini game already has the power up feature (and I'm pretty sure you can also hit people off the sides of the parkour, or was that removed?).