To build and install for testing:
git clone https://github.com/bryceml/epsxe-snap
cd epsxe-snap
snapcraft
sudo snap install --devmode --dangerous *.snap
It appears that https://github.com/ahimta/epsxe-tools is making a lot more progress than this project, so I don't plan on continuing this project. You should probably use https://github.com/ahimta/epsxe-tools instead.