These exercises may sound like something out of high school, but they are excellent for all upper body. Biceps, triceps, shoulders, back. Even abs get definition.
For legs do squats, walk and take the stairs.
https://en.wikipedia.org/wiki/Burpee_(exercise) lists a number of interesting variants, if you have the space at home for them.
https://en.wikipedia.org/wiki/Calisthenics has some more ideas that might be amenable to the half hour time window.
They require little or no equipment and you could make your routine more interesting by doing some of them outdoors when weather allows.
These exercises may sound like something out of high school, but they are excellent for all upper body. Biceps, triceps, shoulders, back. Even abs get definition.
For legs do squats, walk and take the stairs.