every time i start the grass appears in black instead of green :/
Hmmm that appears to be the undocumented colors not loading in on your handheld:
https://pico-8.fandom.com/wiki/Palette#128..143:_Undocumented_extra_colors
I'd suggest updating the device's pico8 version, or trying another game that use the undocumented colors to see if that's the issue such as:
https://spratt.itch.io/woodworm