It's a really neat concept, but I can't for the life of me figure out how to get anywhere once the secondary colours are introduced. It seems like the ghost doesn't change colour until the sprite itself moves instead of when the arrow key is pressed, so sometimes you'd be stuck on a wall that requires blue, and even though you're trying to go a direction that would change him to red or yellow, because the sprite doesn't change, it doesn't really convey that the player has done something incorrectly, and it feels a bit more like a bug.
I do think this is fun aside from that though, and I love that he can only go through walls, because who needs doors anyway =P
Viewing post in Haunted jam comments
yeah i noticed that issue a bit too late, didn't have enough time for others to test it and when they got the chance to it was something i noticed. still glad you enjoyed it, and the door and wall thing came from a community quote that i recalled wrong, but it went something along the lines of "ghosts can't go through doors, it's not fire" and decided to make that as a fun little dumb mechanic.