I only did up to the start of the tile phase so far, but it seems like it could be done casually up to there at least, once people are used to the mechanics (which only takes a few hours of prog).

Maybe reducing the reliance on eachother a bit (so a few people can mess up at a given time) would help. If it is to be midcore content, it should still have people rely on eachother in a phase like that, just with room for a small percentage of people to mess it up and survive. Because they nailed that with the pads against thunder god before the nerf in my opinion.