Can I mention that Level 4 of the Mailroom duties is a bit RNG based. If you get the delivery task on the far bottom left (by the trash bins) more than three times in a run, you can't get a three-star approval (even three times is tricky if you get the one on the far top left too many other times). It takes too long to get there and back (about 50 seconds for a round trip), and jumping off the edge to save time deducts points.
Might be worth adding a faster way to get back or swap the position of the middle delivery slot and the mailroom.