I finished demo, all songs and here are my humble thoughts and BUGS found:
1. Cream Cheese Icin is much, much harder compared to Nami, Stir & Mix and Grease Poppin. Finishing it took me longer than those 3 combined, even when playing demo for 2nd time. I enjoy this game being hard, but first song (excluding tutorial) easier than 3 next ones including boss isn't something I expected. Still easier than Tennis and Sidechain
2. Hard mode would be amazing, but I'm sure there will be one in future if there is normal and easy mode already
3. "Making wish" thing is masterpiece! :D
4. I like old Cream Cheese Icin little more. Voices, music and all. Only change I would prefer to be is spray painting
5. First bug is seeing trough walls, once you're touching them. You can see under Melodii's stairs, trough walls in her home and outside
6. At the end of Sidechain Fever I had lags. Not to big ones, but lags in rhytm games are lethal.
7. I'm not against it, but in this world, politics etc. Melodii's interaction with bathrooms in McWave's can be disliked by people
However I still love this game, can't wait for full version, will totally buy or preorder it and personally I find Sidechain and Nami songs best <3