Finally got round to (re)releasing my take on the 8-bit 3D maze classic, Phantom Slayer, ported to my own Pico-based hardware earlier this year, but now transferred to the PicoSystem — and upgraded to C++ and colourised.
It still has a few more opening sequence sounds to add, but that’s just a bit of cosmetic frippery, not least since the PicoSystem’s piezo speaker isn’t exactly loud. But it does the job for the main part of the game.
More details and code on GitHub: smittytone/pico-system-phantoms.