I really like this! The puzzles are fun. I know you said in one of your videos that you might take the face off the magnet but I think it's cute how it has a different expression depending on whether you're holding it.
If anyone playing on Mac has the error "Can’t be opened because apple cannot check it for malicious software." you can fix it in your security settings.
If you wanted to (and I'm aware it's much more work) I think you could make this a physical game as well! Just a cloth bag with different colored dice (and ? dice) you can draw, and a little grid tray to put them on.
this is very clever, I love it! Found this from the GMT video.
only feedback I have so far is that it's sort of annoying to have to drag the die into place to use it--it'd be nice to click the die I want and then use the arrow keys to determine which direction I point it.
