Oh, you're probably right! After looking up Muse Dash, I have to agree that this game is very, VERY similar to Muse Dash. Like, "hey, can I copy your homework?" similar.
While I agree that Unbeatable has more polish (probably), I don't really like the blatant copy/paste they did with the gameplay system. If they were upfront with it, e.g. "We were heavily inspired by Muse Dash", I wouldn't mind. But I think that, intentionally or not, they're trying to sell a product that's less original than it implicitly claims to be.
I'll reach out to the developers for clarification.
EDIT: They sent me an email response. They point out that;
=The game started development 6 months before Muse Dash released.
=They think their system has far more complexity than MD
=They’re adding in a full fledged RPG mode
=Pero Pero (the Muse Dash developers) follow Unbeatable on Twitter, so they’re aware of the game’s existence
I think all of their points are pretty valid, so I’ll un-retract my first post.
Anyways, this was a really weird rabbit hole to go down, but I’m glad that I have the answers now.