The game doesn't take into account a lot of things and is a bit easy with me earning a million per day really quickly, there is also no visual changes so it just appears as a button clicking simulator.
I believe some stats are wrong, with the stats saying im earning 1m per room, however i had 100 rooms, meaning that if I earn1m per room i'd het 100mill per room which i didn't

I like the concept, however upgrading the rooms doesn't actually decrement the money. Also you never lose any dirt if you have 1 cleaner per each room, so the game is a bit easy.