This game is absolutely adorable, but falls short in...most regards. It's a real shame, because genuine work and care clearly went into this. It sadly just wasn't quite enough to be great, and struggles to even reach 'good'.
The voice acting is outright horrible and makes me cringe enough to want to shut the thing down instantly. It's extra work to have it in there, and honestly, it would be better off without.
The characters are visually pretty cute to look at. They're simple in design, but aren't eye bleeds, and watching their animations is really nice. They move enough to feel like more than just lifeless puppets, and the animations just add a great amount of flair. It pairs greatly with it being a rhythm game as well. You immediately see that once in the game and the characters move to the background music, subtle as that music may be. It just feels nice to see a game that actually oozes some style.
Sadly, the gameplay is kinda rough. It's not bad by any means, but it's not very good, either. This game suffers from what many amateur rhythm games do. The music is dry, slow, and boring. More importantly, the beat that you're supposed to follow is basically non-existent. You create more of a rhythm from the ship's gunfire than you actually hear from the music. It's not immediately discernable what beat you're following at times, and though you can fall into a rhythm with ease, it's not because of the music.
Never does the music stand out, nor does it compliment the gameplay. This game is very ambitious despite its otherwise small scope, but that's just what comes with making a rhythm game. If you don't have the music to back it up, there's not much of a point.
All in all, not bad, but not really worth your time unless you're really into this type of thing. The idea is lovely, but there aren't enough hooks to really make playing through it worth your time otherwise.