So this was definitely not how I imagined flame sphere to be, cause as it stands it's a bit silly looking. It shouldn't act on its own initiative and it shouldn't be able to attack since that's not how the spell works. It would work so much better with the way you handled Moonbeam where there's a separate widget to recast the spell as a bonus action to move it around inside an enemies space.
As for druid, I think you should handle the class a bit more by the books, wildshape for example actually use the stat blocks and creatures from the tabletop (except the intellect devourer, that can stay for being badass). Dire wolves for example (something only moon druids should have at this level) don't even have multiattack or pact tactics.
