The Linux port does not start, possibly due to using an absolute path for libsteam_api.so.
./SpookyGhostsDotCom: error while loading shared libraries: libsteam_api.so: cannot open shared object file: No such file or directory
Please fix this.
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same on Debian. game uses steam protection to run. instead of looking for a solution to link that steamAPI file you'd better ask why it happened on DRM free storefront. I just sent error report, hopefully itch support can review this game and will ensure we don't need to dance around steam DRM to run this game.