Hades 2 is absolutely worth playing right now in this unfinished state, but know that it's going to be a while before it gets its final coat of paint.
At the very least, Hades 2 is worth keeping an eye on as it grows over the next several months. Few action games are as satisfying to play as their cast of characters are to listen to: Hades 2 is as much about a wounded family seeking revenge as it is about carving through layers of the underworld with a godly arsenal of weapons and magic. It's also Supergiant's first sequel, which will hopefully expand on everything that made the first Hades an exceptional roguelike.
Hades 2 is set some time after the first game and stars Melinoë instead of Zagreus—although the two are brother and sister and share the same basic combat abilities. The family of gods at the heart of Hades 1 are gone and Hades 2 is a story about what they left behind. If Hades 1 was an angsty, red-hot fury, Hades 2 is an angry simmer.