This was a lot of fun, thanks for making it. I did have a problem with the Linux build (I’m on Ubuntu 20.04). Both 32-bit and 64-bit versions refused to launch, either from the Itch.io launcher or directly. Launching it from a terminal, all I get is “error while loading shared libraries: libSDL2_mixer-2.0.so.0: cannot open shared object file: No such file or directory”.
Fortunately, the Windows version worked fine through Wine in the Itch.io launcher, and I was able to enjoy this “Undertale-like” (is that a thing? Well, it is now).