I'm writing a website for people to post their maps, which will *hopefully* release with the main game. But there's a discord server created by one of our playtesters which might be useful:
Update: The game has been updated to make levels easier. In the final game, we might see 3 different difficulties for each song (though don't count on it).
To answer your mobile question: The game will be released on Steam, but a mobile build is definitely possible. Our game engine was built from scratch to support mobile, so it wouldn't take too long. My only concern is syncing that up with Steam services.
To answer the other statement: The demo will definitely be getting an update to make some levels easier. I've been watching people play, and the game really is a little too hard for most people; I might be the best person in the world at this game, and I find the "hard" levels extremely easy, so it's definitely a problem with internal bias.
I was thinking that music could be a distraction, and if anyone wanted music they could just open Spotify or something. I could look into getting a track commissioned for the game if that's something people would be interested in?
This is called Chording, flagging like that only works when there are only tiles of that number around the tile. You can see how many there are by the outline around your cursor tile. If there are more or less cells around a number tile than what it sums to, it will not work.
