This game looks like it has good potential but lacks a few basic capabilities of a slave management game. There's no way to increase the semi/steady income from purchased slaves. There is only 1 real way of reducing slave upkeep expenses and that burns through low value slaves relatively frequently with no consistent way to get and get rid of cheap slaves or to maintain those cheep slaves to avoid needing to get rid of them.
It seams like the style the game currently requires you to play is to buy a slave tailor it to a specific type of request and wait for the request to appear on the wanted board. Not really the type of gameplay I particularly enjoy as its especially high risk for what looks like only a moderate reward.