Thank you for playing! I have never played Dorfromantik but I just googled it and it looks cute and very similar to this mobile game that I was inspired by called Land Builder. I see that it is a board game too, I will try to play it with my board game group :)
Sorry to hear that you didn't get the right tile. I played the game a lot during develpment and it's true that every now and then if the RNG is really bad you can get stuck. I tried to balance it out with some player agency with the locking of tiles and the bombs but it's not enough. I was also thinking to make the offered tile not truly random, and increase the chance of the tile the player needs as the board gets fuller. I am currently doing this with the bombs and it works nicely. Maybe after the jam ends!
Bombs were certainly helpful in stalling for time. You may consider doing something like Tetris, which uses a bag system to ensure every piece shows up once in a given 7-piece series. Though your game has many more tiles, so it may still be tricky. Or perhaps, you could allow bad tile placements, but at some sort of penalty or cost for each mismatch.