I created a snap package for LibreSprite. You can try it out on Linux (with snap package support: https://docs.snapcraft.io/core/install) by running

sudo snap install libresprite-simosx

Then, run 'libresprite-simosx.libresprite' to launch it.

Follow here the discussion for getting an official snap package of LibreSprite: https://github.com/LibreSprite/LibreSprite/pull/25