For those that own Cult of the Lamb, how similar is it to Isaac?

I'd say the town building to dungeon crawling ratio is about 60/40. You need to have a certain amount of followers in your village to unlock the gates to each world. They also grant you the xp needed to unlock power ups for the dungeon and village. The dungeon aspect is very simple from a gameplay experience and the bosses are fun enough. It's a fun cute little game that you can run through in 12 hours.

If you've ever played Actraiser on the SNES then this game is closer to that.