My friend was playing through my game today and ended up stuck on a level because it wouldn't let him use the left and right arrow keys at the same time. He got around this using another bug, where he clicked off of the screen and let go of the left arrow, clicked back on, and pressed the right arrow. It wasn't exactly a new feature but I did try and encourage the player to explore new was to use their controls so I think, as a bug, it fit into the game pretty well.
You can check it out (hopefully bug free for you) here https://itch.io/jam/gmtk-2019/rate/463668