The individual 'prestige' of each character could let you choose one of their unlocks to make it permanent
After getting all of their unlocks, the character itseñf could become permanent, and enter the bus directly on day one
I would like the ability to inspect the map without ending the day first
A stats page listing info from both the current loop and the entire lifetime of the save would be interesting
A third upgrade after drills and villages: infrastructures
You'd be able to add 1 of each Infrastructure, and multiples of those that fit the current tile, each would add depth to the title's hole the more you stack on it, and make the tile produce additional materials that can drop different to that of the tile, like letting you produce love orbs with a "bordello", and "helpers" with a "nursery"