Very well done game! Simple but does what it mean to do in a very enjoyable way.
How did you implement a highscore system?
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Thanks for your kind words!
I used a tool called Leaderboard Creator by Danial Jumagaliyev (https://danqzq.itch.io/leaderboard-creator). It's aimed at Unity, but I believe it can be implemented for other game engines too. Here's a tutorial on setting up the leaderboard by the developer: