Really fun game, with a little bit of a visibility issue but you get used to it.
Haven't tried the multiplayer yet, but I can only see it getting better.

Tried Normal mode once, and beat Scholar's Nest, unlocking Hard mode.
Spent 7 hours struggling to beat Red Darkhouse on Hard.
Spent 6 more hours to beat each of the bosses once on the first stage.

When I finally beat the Churchmouse Street boss, I was going to go back to Normal mode and try to beat the game.
But then I beat the second stage, and the third stage, and the last boss.
The struggle paid off, it was awesome!