I feel like the multiplayer shootout might be where the most fun can be found.
As you describe it, pix, without any real physics and being more or less glued to the ground, the mechanics are basically those of a third person run-and-gun shooter.
I tried a 2 player game the other day, and I will say the shootout mode was the most fun.
But even that is a bit hampered by the fact that it can only ever be 1 on 1. If there were a way to get more players on a map, I think a kind of deathmatch might actually be fairly fun.
Edit:
I wonder if there is some way to have up to 4 players using split-screen? I haven’t found any options for it though…