Could use a lot of tweaking - possibly most importantly, why is the town part of the mining screen at all, let alone something you can incidentally blow up if there's gold under it? I'm glad it's not a physical obstacle but it's not the greatest idea.
Made one house and now I can't make anything else because the cursor is bugging out and won't drop the house OR let me select anything. :/ This is after hard resetting after making 2 houses because, as FesterBats pointed out, if you make 2 houses you are completely stuck. Game should start with 1 of each building or at least a tutorial.
AH, OKAY. Remember how Becky's phone fell because your reflection couldn't take it? And how llehctiM opened the door for her reflection because your reflection couldn't? So even if Daniel takes the sock out of the laundry room to a reflected room, since leinaD isn't there, the mirror sock stays put/nonexistent. The solution is to get your key and the mirror key, try to give the mirror key to Becky's reflection, and then give the normal key to Becky.