60 HP doesn't mean much when even the slightly closer to level 5 enemies we run into chew through your lack of AC and more than 40 damage a turn. It's better than nothing, but moon druid is extremely underpowered at the moment and it's not clear how they'll scale it to be better. One obvious thing, as I've mentioned many times, is overcome their programming limitation and allow the transformed druid to maintain control over its concentration spells. That would help a bit, since you could use the old druid classic of casting a spell, transforming, and hiding or flying to safety and then maintaining control without getting hit and losing concentration. That's the moon druid special, as far as magic is concerned, and as it is now you have really no reason to go moon instead of land. Polar bear just isn't close to good enough, not without 2 attacks like 1 CR transformation bear is supposed to have.