It's a zip file, which is kind of like a folder. Open it and pull out the folder inside it onto your desktop. Then you should find the EXE inside that!
The Linux executable is giving me a Segmentation Fault. I've tried running it without any script and with the hello.c7 demo. I'm running Ubuntu 20.04 LTS
Very interesting concept! I feel like one thing that would help would be having some visual cue for where the map ends. Love the monster too, it's very cute!