Today the devs of Million to One Hero posted this to Steam: https://store.steampowered.com/news/app/595270/view/3685676995279454971?l=english

Due to low player numbers, the servers for the game will be shut down, the game will be taken off the store, and it will apparently be unplayable after that. I'll be checking to see if that's really the case, because that would mean that the tutorial/campaign levels will also be unplayable. In which case, if there is really no other way to play those levels, then it'll mean that this speedrun page will have to be removed.

Personally, all of this doesn't surprise me, but it does make me feel bad, as even though I ended up dropping this game after a while, I still thought it was a decent platformer that was fun to speedrun.