Love it. Some thoughts.
1. Full screen doesn't work for me. Not in Chrome.
2. Any-key to play is great, but that should work too for the menu select system.
3. Wish there was more in-game progression. E.g. clear one screen to go to the next. Or at least, have the target balls reappear when you clear them all.
4. A download PC / Mac version would be great.
5. Would be nice to have symbols for Play (VCR play symbol), Settings (cog or spanner symbol), and quit (European EXIT sign)... for those who can't read. Ideally symbols/graphics for the other options too.
Fun game.