Some feedback from my experience playing the HTML5 version on a computer with a mouse (Firefox 19) and on an android smartphone (Chrome 18):
- On both platforms the "LOADING" message does not go away after hitting "close" on the little instruction cloud, and the level does not load. Only after hitting the reset button (with the circular-arrow symbol) does the level load.
- On my smartphone, my finger tracing can easily outpace the tile coloring, and this leads to some tiles being skipped. The animation is also choppy. Probably not an issue on the native version.
- I think you should prevent diagonal tile markings since they do not work to connect the star tiles anyway.
- If there was a way to stop accidental over-writing other colors due to clumsy mouse usage, that would be nice. This seems like less of a problem on a touch screen.