Posted February 01, 2021 by Jenny Schmidt (bikibird)
Unfortunately, the previous version of the app was using colors from both the standard PICO-8 palette and the hidden palette, which may have resulted in images that use more than 16 colors. I apologize for any inconvenience this may have caused. I've released a new version which corrects this to use just the standard palette of 16 colors.
A future release will allow you to create a custom palette of up to 16 colors selected from both palettes.