4.0
It has an interesting story, about spaces and planets. The gameplay is mania mode (kind of piano) with 7 button's note in total (5 above + 2 below). So i guess this must be a game with no challenges. Nah, I'm wrong.
I've tried the Hard difficulty, and wow my fingers can't handle the blue and red notes at the same time!! It really challenged me, challenged my anger to get 100% accurate!

Fact : This game have the most beautiful musics than the other for my taste!!!
You should try it too, maybe you'll like this new rhythm game. (◍•ᴗ•◍) Oh.. there's a chapter which only available by purchase with real money. So, the game isn't 100% free.
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somethingigues5
4.4the progeniator of Sixtar Gate: STARTRAIL (on Steam and Switch), it has a cute story but it's locked behind a paid DLC. the rhythm game itself is free though, it's a gimmicky 6 keys rhythm games with occasional "gate" mechanic where sometimes a 7th key will show up in the pattern. the game has a very solid lineup of original music (feat. its sequel's music for some reason) so it's worth the try whenever the devs aren't struggling with keeping the servers up LMAO