It needs tweaking though. The gameplay is tedious and too simple. The square is extremely slidy; too much so. I recognize you made it for momentum purposes, but make the deceleration a little quicker. Also, it's strange that there are different colors falling. I would have preferred that you had to collect, say... A certain number of a certain color without touching any other colors. Something like that would have been a bit more fun. On top of that, the mines were just annoying, and I didn't get the point of the different colors. An even better idea would have been implementing a timer, and then at the end, giving you a score based on your longest streak of hitting the same color in a row. Two elements that would have spiced up the gameplay a lot.
And of course the graphics have to be worked on. Maybe you're more of a programmer than an artist, as am I, but you need to practice becoming a jack of all trades, at least to some degree. Give the circles some texturing, make a SIMPLE background, etc.