So, the third worker slot costs 1500 kreds ($150). It doesn't really seem all that worth it to me. I'd like to suggest that every time your store levels up, the cost in tokens is reduced by a certain amount.
There should be a way to increase the amount of hearts gained by clicking. After a while you passively gain quite a few hearts for everyone, and with the abundance of money its currently better in the late game to buy the girls their item of choice (or a new car) to get more hearts since the cooldown can go down to five seconds.
5/5. Do you think you can make a slider or some way to adjust how many people you can reincarnate at a time? When your maximum population gets over 1000, it takes a few minutes to reincarnate everyone.
If you line the bottom with launchers and put saws above every launcher you can have an infinite combo..... at least until you get bored and exit the game.