This doesn't really seem like a game issue though. If you want an easy game Rimworld provides every possible way to customize your start and game to make it easier. If you find your current game too difficult start a new one that is easier.
Yes starting tribal nukes your research speed. So don't start as tribal or change your research rate. This can also be done via the ideology you have.
That's what is great about Rimworld is how customizable it is.
Second this. Amazing game that I've been following since it was called Starfarer. Highly recommend.