This was pretty alright. I only half-followed the story on account of I don't speak German, but a game like this seems like a fun way to learn.
I did notice some bus though, most notably that you have to go into the files and change DavilexGameJam2023_Data to DeVerdwijningVanDikVanDale_Data to get it to run. There's also some logic bugs. You can also just go right to the end cutscene by walking into the door without talking to the police or finding any of the letters, and talking to the police after you've found the last letter spawns the first one again but you can't interact with it. There's the obvious visual stuff like the characters lacking animations and the floating barricades, but did you notice Frank's run animation appears to be a run backward? Look at his feet, he's running backwards.
This was very cute despite the bugs. It needs quite a bit of polish, but it's a game jam game, so it's all good.