Axis for Atari ST is a PD puzzler worth pondering.
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Published on ● Video Link: https://www.youtube.com/watch?v=DfeBfFL8y1A
Atari ST A to Z is back! We kick off with an "A" game: Axis, a colourful public domain puzzler developed in STOS Basic by a prolific creator named Ross McNaughton, aka Serious Software. I am too stupid to solve the easiest level in the 7(ish) minutes available, but perhaps you can do better?
Grab the game for free via Atarimania: https://www.atarimania.com/game-atari-st-axis_11148.html (you will, of course, also need an Atari ST or a suitable emulator also!)