Ah sorry to hear that! I made it in Godot, and I didn't think to consider other keyboard layouts.
There's definitely a few issues that I should've spent more time on, like the note sequence detection, or gem collision. I tested it by myself quite a lot, playing at various speeds, but as soon as I let someone else test it it seems to fall apart :') Right now it seems to help to play the sequence more quickly, and not let notes overlap. Technically this shouldn't matter, but you know.. Most
It's a janky project for sure, and I did end up spending too much time on looks over mechanics. I'm happy you enjoyed the atmosphere though, and appreciate your feedback. Thanks again!