Hey if you downloaded the game more than 10 minutes before this message, you got your hands on a special limited-edition release where everything is broken. >:}
Maybe grab a new copy (v16+) if you want to play the games. Rest assured though, v16 has similar special features like game-crashing bugs, half finished builds, and outdated credits. You might want to check back in later for patches.
If you're not using the itch client, I highly recommend it. We will patch in the final cutscene/credits and a special game for the 24th later on in December and there's no need to download the whole kit again. The client makes updates super easy and it's not a creepazoid DRM system like steam or epic.