Generally a fun concept, only major critiques are that after matching the item on the right, it doesn't immediately change to another, leading to less than fun times as you have to match it again instead of moving to another shape, as well as the fact that passing can randomly swap into the same shape you just passed - if you choose to pass it, getting it again feels like particularly frustrating.
Other than that, again, the general concept is fun, and I can see it being expanded on nicely.