Okay, this game is great, but I have a bone to pick over a few things.
1. There is a significant difficulty spike from level 1 to level 2: it's much longer, there's way more complicated stuff thrown at you, and as Sadazen pointed out, the yarn seems to sometimes go out of sync with the music, making it very difficult to get down.
2. I think it's pretty unfair to penalize players for tapping the wrong key, especially when you introduce hitting two keys at once in level 2. I would've never gotten past that level had there not been a system to restore health (thanks for that).
3. My biggest complaint, why are the key presses randomized? I feel like that's completely antithetical to a rhythm game to randomize everything. This makes continuously retrying the same level over and over again feel so much worse because I can't memorize the patterns to get better, I can only really hope that the RNG is more favorable.
4. This is more minor, but I feel that the yarn lines and the pixel square needed to be, like on top of each other or something (think guitar hero). As it is I spent all my time looking at the left side of the screen and couldn't pay any attention to the square, so I couldn't see how far into the song I was.
With all that being said, the music is great, the art is great, it has a fantastic atmosphere, and I did find myself wanting to replay it just so I could get through it. I just think it could use a little bit of tightening up.
Also I found a bug in the game where if you spam a key and immediately lose at the start of a level, half the time the game seems to screw up upon reloading, making the square where you see the image and one ball of your health vanish (they're still there, but for some reason they're invisible.)
