Thanks for playing through so many levels.
Glad to hear that you found 3d folds intuitive. I updated the tutorial for that many times last week since people kept having trouble with it. Still got a long way to go.
Keeping 2d mode for 3d folds is a good suggestion. Once you're familiar with how the 3d folding works, 2d preview is actually all you need.
Thanks for the bug report too. I've never had that bug happen before.
Regarding level progress, the game does save in the pc ver. Saving in WebGL has issues. Also, the pause screen shows the level name.
This is my first time playtesting the 3d levels so the difficulty curve there is a bit wonky. That level is solvable
Sln spoiler if you need it[decode via rot13]
Lbh arrq gb wbva gur pvephvgf sebz obgu jbeyqyvarf gb cbjre gur tngr.