very strange because “Enter” or “Space” works well for me.
But I didn’t have time to add an error sound for incorrect answers. Perhaps your proposed answers weren’t good.
And yes i change one wall in the level 3 to be sur to have just one solution.
I replayed it on the html and enter or space worked just fine. I downloaded something to run .gb for this jam today so my buttons might just be wierd or messed up on the gb side. Anyways, good job!