Thank you so much for playing Cyclics!
3-notes with up & down are a little bit tricky to get used to, but in the upcoming v0.0.3, which will have custom keybinds, hopefully players can find their most comfortable way to play it.
About the note validation sound, I will try a few other sounds to see which will be the best one, maybe letting players choose the sound effect like the other rhythm games will be cool too!
Thank you for your kind feedback :D