I really love this game. It's one of my favorite indie platforms on itch.io. I only wish there was a level editor or more levels.
I recently upgraded from Linux Mint 18.3 to Ubuntu 19.10 and the game wouldn't work. The linux version is compiled against the 32-bit version of the libssl package, which isn't supported in modern Ubuntu-based distributions.
You can get libcrypto-1.0.0 and libssl.1.0.0 from here. Open the file as an archive and extract the two files to /lib/i386-linux-gnu/ and the game will run.
It would be great to see an updated 64-bit Linux version of the game though