I feel like this game would work perfect with Battlerite premier game mode.
5 rounds first to 3 wins
deaths per round no revives
ultimate pick up spawns in middle
health and ultimate small pickups scattered around
death circle after extended time to force a brawl.
This game honestly seems like it has the perfect mechanics for this already and I think it would be more enjoyable than the first to X point game mode they have currently.
I want to point out that a games casual mode has a big effect on a game as a whole... this is really apparent when you look at games like heroes of the storm that it's quick match hurts the game more than helps.
I feel like the lasting effect of death is really popular with the kids these days and will promote team play since the only objective will be to out team fight the other team in this game mode... currently in some matches you have people just running around trying to be the solo hero looking for 1v1s... doing this in this mode would just get you 4v1 after your team dies off.
I don't feel like this strays to far from the devs original design of wanting this game to be a more teamfight pvp focused Brawler moba than a pve farm up get fat moba.