For help, press 'F1' while playing
Feel free to give me some feedback.
I might try to include those in th next release.
Help menu. (Something more visible then the F1 key)
Difficulty selection menu. (Something more visible then the F12 key)
Add a background (a fix image, or some moving starts).
Polish the font.
Add sound at the beginning and ending of a level.
Web start (for playing in fullscreen).