Only real change I would want to see (other than more content) is a way to make the first SP reset less annoying. Like many Incrementals, the first SP reset is a MAJOR annoyance since it darn near makes you replay the game from scratch. I am not saying to make it trivial, but it is still aggravating.
Also, in case anyone else has trouble making it to lifespan increases after the last Time upgrade: Turning on autobuy is darn near mandatory at that point.