Rather good, though easy and short
This game is extremely good. Very clean in terms of design and gameplay, in sync, and that volume meter is a nice touch. However, it was extremely easy. Sightreading all six songs (and I had hoped there were more), I 100%ed four of them, and got a 96 and 92% on the other two. This is coming from someone who avidly plays a lot of rhythm games, though, so take it with a grain of salt - but this game lends itself to being much more difficult. I hope you make a sequel. Also, and I'm really nitpicking here, it'd be nice to send you back to the song select screen when you finish a song rather than bringing you back to the main menu.
tl;dr: Extremely good, but make it harder and add more songs. 9/10; 4/5