itch.io

You can actually play on easy mode if you go to Quick-Groove from the main menu. On the bottom right, there's an option to change difficulty for each of the maps. I hope this helps :)

I 100% agree on both positive and negative points. I see a lot of people saying that it's too difficult, but yes, it does get easy after a while of practice.  

I  want to point out that
1: I experienced trouble with pressing buttons on  VS. Synthz McWave in addition to the two that you mentioned, so  it might just be a bug on all the maps.
2:  I S-ranked all maps     on keyboard, so I think the part about needing a controller might just depend on personal preferences.

But yeah, this game SLAPS.   Love this type of rhythm games.

Yes.   From   Options in the main menu,   go to the  controls tab (either by clicking on the tab or using right arrow key), and under Controller Layout,  click on  (or navigate using arrow keys) where it says Keyboard. 

Try going to  Options from the main menu, then make sure Windowed Mode is unchecked. If it is    unchecked    and still not fit to screen, then adjust Screen Resolution.

I S-ranked all songs, but after S-ranking (with 3D mode) Grease Poppin', all other songs show as A-rank. S-ranked them again but still shows A-rank, with the high score stopped at 1650. This might just be because 3D mode is still a work in progress, but I'm wondering if my actual scores are still saved somewhere in the game file.