Response to D-Flare's review
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You can return to previous floors for more money and new minions, you have to completely leave the floor and return from the floor select. I think you have to complete it again every time before you can refresh that floor again. (Don't use the 'save and return to lobby' option, go through the door at the end after choosing another egg.) The same minions are in the same spot eggs not random. (I'm pretty sure, I only checked twice so far but did get the same minion from the same egg twice.)
I do agree with D-Flare tough that it is extremely annoying that you are force to take the first egg you select. (I don't yet know if all eggs per floor are unique, I still have to check on that.) I've only collected the first seal so far, but I am liking this game very much