Fun game, although I agree with the suggestion to add a "rotate tile" option. (Or would that make some of the goals too easy?) I always love to see games that run natively on Linux (Mint 19.3 on a custom System76 box) and encountered no issues at all with this one.
Viewing post in Dorfromantik (Prototype) comments
Unless they've changed it at some point, tiles where rotating is relevant, which is just rail tiles, already auto-rotate every time you select/reselect a tile space. So if you have a rail tile with 3 connections and you want it in a Y shape, all you have to do is repeatedly mouse over the tile you want to place it in until it shows the shape you want.