Hi. Glad you're enjoying the games! :)
For Parabox, in this thread https://itch.io/t/2017621/mac-build I determined that there are two workarounds for this issue:
1. Install the itch.io app (https://itch.io/app) and run the game from there.
2. Or, run the commands listed in that thread to fix the perimssions.
Possibly these workarounds will apply to Linelith too. Sorry for the inconvenience.