- You start the first nebula.
Would changing this to "winning the first nebula," or at least 30 mins or so into the first nebula, permit a significant amount of cheese? Having the nemeses spawn immediately upon entry would likely unpleasantly surprise someone first trying out champions (I just imagine the champions coming out to a post-apocalyptic wasteland and wondering "what happened?"), especially given how micro-intensive some of the early scenarios are.
Also, if I luck into a nebula on my home planet, I'll sometimes decide to knock out the first scenario while I'm waiting on my initial fleet to get built. Wouldn't be the end of the world to lose that option, of course, but it's nice to have (since the nebulae are supposed to give you something more interesting to do than watch the ship count tick higher).
Edit: Another thought --- would a size vs spawn frequency tradeoff be possible / desirable? With the current setup, they seem (to me) to spawn with enough frequency that if you're not hunkered down pretty well by the 1 hour mark, it can turn into a game of whack-a-mole where you don't really get enough time to plug the holes they find in your defenses before they're knocking in another door, especially since all of your border worlds are fair game. Increasing the limit to 3 hours would give more time to hunker down, but the issue of having to have enough defenses on every border world remains.
Finally, would it be possible to add a warning message that champion nemeses are at a particular world (e.g., one with scout coverage)? Or is the "Surprise! RAIDING PARTY!" behavior intentional?