The transitions is very repetitive and adds no value to the run. I suggest either take it out or allow the option to skip it; Grim just becomes silent after a few runs, so what's the point of having that transition? Could go a different direction where you just let the sim run endlessly and have upgrades and/or allow reapings at certain intervals. Leveling contributes nothing to the game (currently at lv30).
The little guys sometimes run (and build houses) behind the UI and/or out of PoV, so you should restrict them into a window.