The latest version of Ubuntu always works for me!
Ok, I tested it inside a virtual machine with Ubuntu 19.10 and there it worked. I also didn't need to install anything.
So maybe it is some kind of missing/wrong-version library in my host system (Arch Linux and Manjaro Linux usually have newer libraries than Ubuntu).
Something that you can enhance in your game: add statistics. How many deaths (maybe even why)? How many of each enemy killed? Playtime total? Maybe (if it exists) playtime per dungeon/chapter/...
This is something, where players could compete with each other ("I have been faster/without deaths/...")
With these statistics you could als implement achievements in the game (like "Monster hunter" - "Killed all enemy types", "I hate slimes!" - "Killed 1000 slimes" and so on). Achievements are a big factor for replaying a game.
But this was just a first thought about your game. I now have to enable the sound in my virtual machine to really play and test it. xD