Well, you did a fantastic job with this tree, it must have been difficult to fit all those mods nicely in one tree. That being said, i have a suggestion I'm relatively new to KSP and i don't know what's the deal with it, but for me it doen't make any sense at all to start with a manned pod, THEN research some basic life-support and THAT should give me access to first unmanned probes. If a player is assumed to have life support installed, how can one get a manned pod before the actual life support? And i really like Better Than Starting Manned in that way, where you have a basic probe and some basic sensors to get started. Come on, barometers and thermometers were invented about 300 years before first rockets, does a space center really need to develop that technology? I think the only way to go in the early game is to have these basic science intruments along with a basic probe and antenna, and build from there. And also parachutes and life support should be researched before the first manned pod, because the logic says that these things are just a part of it. And that way you can first test your parachutes with probes before using them with actual greenpeople. Aside from that the tree looks great and i wish you best of luck with further development.