Uncanny Cat Pet

Windows: Just download the EXE and start it. In case, you get a popup that says: "Windows Defender SmartScreen prevented an unrecognized app from starting." Click "More info" and then press "Run anyway". This is an issue with a lot of software on Windows that I sadly can't really fix.

MacOS: After opening the DMG file, you will need to put the .app file into your Application folder, or just place it on your Desktop. After starting the .app for the first time, you will get a message saying that the file is potentially not safe. You then need to go into your system settings, into your privacy settings and then scroll down until you see an "open anyway" button. Press that and then press "open anyway" again in the popup. The game should now work.

Linux: Just download the zip, unzip it and run the script.