One of the most original versions of this game. I especially like the power-ups. I also like the concept of two of the same color being different colors. I've never seen this before and it's pretty game-changing. The biggest problem with this game is the difficultly level: It's about impossible to beat this game. Level 7 already gets quite challenging and Level 8 is just really hard. In fact, I couldn't beat it. I can only imagine Level 9 being impossible.
You might just turn down the difficulty just slightly. You can for example add lives or something, or more lazy power-ups. You can also add passwords to jump to certain levels. You got the idea.