Simple fun
The game overall was VERY simple. But this is not that bad. The simpleness kept me playing for hours (well, 1 hour but still) there are just a few things that I would improve: 1) Make more modes like *stops to play* endurance and one where you try to make the biggest chain possible.
2) More power ups like a destroy all enemies power
3) And finally, the snake style movement was good but it stuffed me up sometimes. Make diagonal movement possible.
Now for things that you should keep in the game. There is just one thing: the simpleness of it.
Hope this helps!
dementos :D