Hi Lascie,
I used a Debian Linux distribution. Debian 10.2.1-6 to test Mannequin Academy. It ran without issues. The game was downloaded directly from itch.io.
Hardware used: 2 CPU cores, 2GB RAM, about 1GB disk space, 16 MB graphics memory
I recommend downloading the latest version of the game 1.34b and trying to run Mannequin again, good luck!