The base gameplay seems decent, however I experienced a lot of lag. It felt like whenever the game board was being updated there would be a noticeable delay, often followed by losing, as a bunch of movement and board changes all took place. Sometimes everything would be OK, then I'd simply lose and never see the void spot that did it. Optimizing the board update would be my top priority. With the lag it is hard to really give much more feedback on the gameplay.
It would be nice if the game over screen included your current coin total, so you know if it is time to hit the shop.