Thanks for the bug report! After reading your comment, I was finally able to fix the bug! As it turns out, it was being caused by the menu explosion effect when starting the game. If you assign jump to a button with lower case letters like "Space", the explosion effect isn't programmed to handle it. A simple one line fix. The fixed version will up shortly.
Also, thanks for suggesting an easy mode. That's definitely something I'll be looking at for the full version.
Thanks for your help!