Great to hear you and your partner are enjoying the 5x5 game! Pico 8 is a system for programming and playing digital games that look like they were made in the 80’s. My picture at the top of this post is from the Pico 8 version of Hoppsi I am working on. When I am done, you will be able to play against a computer opponent in your browser.
I still want to test the “forced biggest jump” rule more. There is precedence for it in some capture games, but usually players get to choose.