It sounds pretty reasonable. Looking forward to look for your progress in the future.
Just an idea - how's about adding a mood modifiers like:-Slows the growth-Speeds up the growth- Gives a slow steady growth on their own etc. ?
The game is great, would be glad to see some other opportunities. Looking forward the other builds. P.S. still wondering if there is any way to beat the 2nd lvl instead of running away.