The multiplayer is interesting. Replays will be weird because if you get past where a player won they will presumably just stop buying stuff, but that should be fine for now. More concerning is that my purchasing decisions are often made in clumps, so a replay where I had 1200 gold so I plopped an aura tower and levelled it up and only then built the surrounding chaos towers and only after that the wall means on an ordinary playthrough when the replay gets to that point it will sit upgrading an aura tower that does nothing for a long, long time.