I think I encountered a bug. I played through one screen with no problems. On the second, the last block was an "X" block, and when I broke it, an enemy spawned. When I defeated the enemy, I could no longer move Ribbon, but nothing happened. I could swing her weapon and I fired the little beam, but that's all. I waited twenty seconds or so then closed the game. I was playing it in my browser in Firefox, is that helps.