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I've tried your game and it is indeed a nice implementation!

If will try to give you two small suggestions to make it imho nicer:

  • Use also a small icon in addition to card colors (it will make memorization process easier / more fun)
  • Implement a timer that will auto-cover the cards if the match failed.

I've found a nice / easy / well done timer API here:
https://www.lexaloffle.com/bbs/?tid=3202

Thanks for sharing your game and happy hacking :)