Would be cool if we can transform excess Glucose into Lipid.
Right now its a bit sad the Nucleus has no option to be modified but from the looks it has the endoplasmic reticulum connected to it. So we can use the Nucleus to modify the Lipid Metabolism in both directions. Additional Peroxisome, Mitochondria and Chloroplast can boost Lipid metabolism while Lysosome can help with its efficiency.
We can store Lipids in Vacuols and it should have twice the energy density of glucose.
It would be nice if the material and the filling level of the vacuole could be displayed graphically. All organelles should be able to be modified, especially if they support 2 different processes.