You did really well for not reading the instructions! And appologies for having such long instructions, but as I said in another post, we didn't have time for a tutorial. For those wondering how to repair tiles in the game, just right click on the tile to get a popup menu. There you can repair a tile. You can also reclaim it to get back some ore if you need to, or even disable/enable the tile.
Thanks for trying our game and the feedback!