Just a personal opinion, but I've already sunk a good few hours exploring the different content of the game, and I think that a "Replacing/Mutating" Mechanic would be nice to have atleast on Savannah, because once im on the current "Mid-Game" I'd like to swap out some of the default werms, their colored variants.
And also, another observation, even though choosing to work on the university yields way more money than at the mall (Roughly 4 times more) i think that it should lower the detection score a little bit more, having both work options provide -7 to detection is nice, and useful, but there are certain points on the playtrough (for example, when getting +5 detection from Michelle and +5 from Michael after they each get their colored worm mutations) where I find it feels "Grindy" to only be able tolower the detection score by choosing both actions during the day just to work, maybe if we could also work during the morning to speed up the process, or there was another "action" in which to spend our time and/or our money in order to decrease detection I believe it could help out with the flow of the daily activities of the game.
Sorry if this was a long comment, but I have been really enjoying the game, and would like to provide my feedback into which kinks I think could be worked on and smoothed out, I look forward to see the evolution of the game throughout the updates :D