This is the best run I can expect to get. There are three deaths, all of them intentional and saving close to a second each. The movement and routes are pretty optimized, but there are a few rooms where fractions of seconds could be saved with intentional deaths or a trickier movement. There are a couple small movement errors in the factory and the underworld, but any other mistakes are hard to notice. I estimate a truly optimal human run could barely sub 4:10, but I don't plan to even try to improve this run. The time is 4:14.250 using a custom timer displayed in the lower-left; see http://www.speedrun.com/Cat_Planet/thread/e7tyg for details.