While the gameplay is unique, the biggest flaw in this game is the mobility of the green dot. The dot simply falls behind your cursor. This may not be a problem if the game is not so demanding on the player's agility. Combining a reaction challenging game with bad controls, and you have a mob of angry people writing negative reviews.
Due to the said flaw, certain stages are just rage inducing. I gave up at the slingshot stage because the green dot just isn't fast enough to catch the red one in time. The tetris stage is like a lucky shot. Sometimes the pieces just doesn't fall into the space you want them to, and the circle maze stage is just boring to go through.
On the bright side, I like the boss stages, as it is a change of pace from the usual gameplay. As long as you are able to fix the green dot's issue, I feel that the game has potential.