I am very sorry you experienced that. Yes, there is a major bug that slipped into the GMTK submission. We have a fixed release prepared for Friday afternoon; however, it cannot be sooner. The current workaround is to not press 3 or more keys at the same time. If you are rating the GMTK submission, we apologize for the experience. If you aren't, I would highly advise coming back this weekend to play without the bug.