Kill monsters, passively get organs, do the mechanic when I goddamn well please. It was even fun to occasionally make one so strong it wrecked you in 2 hits. I would spend a minute looking at the organs I was putting in combined with the map mods and then evaluate how many portals I would need open to maybe win. And then you got the free fights/loot in the lab after 20 or so maps. It was great.