Congratulations to the developer(s). This is the fist video game my mother has played in years (that isn't based on a traditional card game). She loves it, I like it. It runs well on the middle-market laptop she uses. It runs okay for me though a stock Wine.

I have a couple of suggestions and requests.

First I would like to request an option to bind the cursor to the game window. It would let me avoid a problem with the game locking up if I accidentally shift focus away. I have found that to be a recurring issue with Wine.

Second I suggest a railway bridge piece.

Third I want to suggest an advanced option for the future creative mode that lets you chose what tiles will appear (and maybe the chance). I want to try playing with a lot more open water tiles.

I also want to echo the request for an undo button. Just for the most recent tile in the case of a wrong click. You could work it into the challenge goals like "finish a game without using undo", "finish a game over 10k points without undo".

Finally I might have a a reproducible bug to report. I'm going to dig for the save file and try it out elsewhere.