Fun little game - def agree with others that the X's were confusing. I hit one and I got stopped and panicked a little - did I do something wrong? I think the text blurbs you offer in the levels should offer a bit of guidance on how the game works, so we can get to playing faster. Also ran into the same bug with the walls in the same level. I do like the concept and the way the game works - it's a fun concept that I'd love to see expanded. Good job!