I didn't realize just how bad my memory was until I tried playing this, lol!
Works very well, I see based on the orientation that you're developing this for mobile? I personally found that the cards could flip over a little faster, but speed that up a tad, add some juicy sound effects (maybe some particles or something to signify when the player found a match - get that dopamine dripping) and you've got a solid mobile release!
Overall, nice work!