Really adorable game! Did you make the assets yourself? One thing to note: in browser the play button didn't work. It brought up a how to play that wouldn't go away unless the game was refreshed. However, the game could still be accessed by going through the level selection. The jump was occasionally a little buggy too, and the key bindings could be awkward (w for jump would have been much more intuitive to me, but maybe that's personal preference).
Ok this is sounding really negative now- we did actually love the game, and had a lot of fun playing. We thought just having the one map would get repetitive, but it's such a good map that that wasn't the case at all.
Screw Mother Ghost though, she ruined my life.