I've had a small issue too launching it on Ubuntu 19.04. It couldn't find the libportaudio.so.2 lib, which is installed by default but not the 32-bit version (needed by the game) on 64-bit distro.
Had to install it with sudo apt-get install libportaudio2:i386
I'm not sure how itch is supposed to handle that kind of dependencies. Maybe the 32-bit lib should be bundled with the game?