Simple, stylish, clear game&watch DNA (although g&w games tend to be a lot more grid oriented, for obvious reasons). I had some slight graphical issues (line of random colours across the screen on the title screen after one of my game overs) but nothing that affected gameplay. You may also want to adjust the resolution on the HTML, since there are big black bars on the sides. My current high score 25 :)
Ah, thank you for letting me know about the glitch. That happened to me once during testing but I couldn't replicate it, and it's probably a result of pushing the background tile limits too far. I'll look into simplifying the backgrounds and hopefully that'll help with this issue.
You're a superstar for reporting the bug, thanks again!