Thank you alot for playing! This comment is gold for me b/c of so much useful feedback here.
To address your points:
* Tutorial: 100% agree: that seems to address the common thread among players so far. I honestly did not realize how hard I had made it, but like you said, once you get it, it really gets going. I think in the future adding a tutorial level will be the best remedy here.
*Fullscreen: My bad, I just realized I accidentally disabled full screen on the itch page. I just checked it on, so itll be available now.
* Bar on the left: That was a progress meter, kinda similar to guitar hero. It went along with score in the upper left and showed you visually how many notes you got. Probably need to improve that UI.
*Score: Yes, currently best % is beats. The hold time and turn length scores are "modifiers" to the beats % score if that makes any sense. I noticed during playtesting that beats by itself was too easy to cheat, b/c you could waggle away and get the majority of points that way. Those two modifier scores acted as a way to dissuade that (tho I agree I could have better enforced those rules in the game). The goal is to get the highest number of beats possible, while minimizing hold time (how long you hold your mouse down on the disc) and turn length (how often you turn the disc). Regarding aggregate score, that's a good idea, tho I'll have to sit down and figure out the math formula to doing that one correctly. All of this tho goes back to your other feedback point too, getting a good tutorial level.
* Pressure: Yep we'll need to add in some failure mechanics for sure. Atm it seems like it's mostly up to the player whether they go for 100% or not. If they do, the experience is difficult and fantastic, otherwise it's a little too lax. I need to study how other games do it.
*Songs too short: That feels like the best criticism ever. Song 3 was originally longer but I was kinda scared I made it too brutal at the time. Now it feels like I have permission to go in there and make it harder :D ... right after I get a good tutorial level working.