NB: Copy / Paste from the ludum dare entry, so everyone can see a comment :)
Hey I just played your game, that was funny ! As everyone said, the main problem to enjoy the game as its full potential is that we have bad feedback and we don't know how exactly our actions influences the game.
Some solutions, great the reaction to actions, a slave missing rest should have an icon, an animation and a red arrow down to show he works less. Happyness / Sadness is a good idea, maybe you should write what it implies (a work multiplicator ? A production per second (eg: 0.5%/s).
Visual are not that bad IMO, simply you made the whole thing on the whole screen so it looks so big ! The text centered would have given a better view for the same work you did.
Anyway, the concept is ambitious, I'm happy there are ambitious games ! I had fun, I'd have liked more feedback, I guess this is your real "problem" :)
Thanks mate ! :D