There's no reason to expect more kinds of interactions; the laws of physics were the same then as they are now. It also isn't clear that there would be more interactions. Galaxies hadn't formed, even if we stipulate that stars could have. So, the good: wherever a planet forms it should be warm enough for life (although it could still be too warm if it's close to its parent star). The bad: There are probably far fewer planets and ingredients for life and there is precious little time. For reference, for intelligent life to form during this period, it would have had to have done so at a rate of about 500:1 compared to the evolution of homo sapiens on Earth. Even life evolving in this narrow window would be difficult (~50:1 compared to on Earth).