This game is genuinely fascinating. It's been a while since I've played something this fresh. The way the feedback changes based on each note when it lands, the sound design comes together so well that it actually feels like you're playing music. I just brute-forced my way through each stage until I cleared them all.
While playing, it actually reminded me of Unicorn Overlord. I really didn't expect to feel that same agonizing pre-battle setup phase here again, but I did.
When there were multiple starting notes, it wasn't easy to spot them visually at a glance. I think it's because there's no distinct shape or color difference to set them apart. Also, while putting in inputs, it would be great to have ctrl+c/v functionality for blocks. Having to copy-paste one by one was pretty tough without it.
Other than that, I had a really fun time getting immersed in it. I think this would land really well with people who love this kind of genre. One suggestion though: adding BGM during the static waiting moments would help keep players immersed and pull them deeper into the game.
Really well-made game!