This game was developed for educational purposes for Bit By Bit (http://littlebitbybit.org/\). Worldwide high scores aren't available yet, but based on my personal experience of watching other people play, the current record is 429. Have fun!
Very cool game. Here is the score board API, adding it to your game will make it much more fun! : https://repl.it/ibuiltthis/games/p/attention-scoreboard-api
@haya: Thank you! I will look into this