Level 11 is broken. The green bug takes over 5 hits. Within this small space this is way more than it should be.

Edit: now it works. But i'm having two problems: first one is that it doesn't save your progress. this should be taken into account when secondly, the game behaves strange. After dying, the "restart" screen appears, but the game already started from level 1. This happened for me on he higher levels. 12 and 17 when i remember right