This was a neat twist on connect 4. The board rotating added a nice extra layer to the strategy of the game. It was also really nice that you could either play with another person or against the computer.
Adding sound would definitely help make this feel like a complete game. Having a SFX for when the board rotates, for each of the special chips, and when someone connects 4, as well as some background music would add a lot.
I also think it might be nice if there was an option to turn off the glare effect that swipes across the board. I think it's a cool idea, but personally found it distracting and a little headachy after a while. I'm not sure if the direction of the effect is suppose to be a clue as to which way the board is going to rotate, so I might have been paying more attention to it than was meant to be.