Seriously, speaking from a aspiring game dev - you have created something very original.
Expand on this concept, make loads more game mods, cars, obstacles.
You could sell this online for $2-5 and make a FORTUNE
GREAT GAME! I kept playing even after acing all the achievements - though I reckon there is room for SO much more. Theme Hotel 2? Can't wait! Though next one should have 20 achievements haha. 18 hard ones, 1 medium and 1 easy. Also, fix the elevators? I reckon what would be great is if you could adjust the prices of the rooms, and if you could upgrade each type of room to have more stuff to cater to different guests needs