No need to invent your own scoring ranking

. The rules on the page 9 of the rulebook say:
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SOLO MODE TARGET SCORE
The preliminary target score for the solo game is 60 medals, and
your final target score is adjusted based on the composition of the
event deck.
When the game is complete, compare your final score to the final
target score. Find your outcome below.
-15 medals: Critical Fail. We’re going to need another Planet.
-10 medals: Any sign of other survivors?
-5 medals: Low capacity, but at least we survive.
Target Score: Mission Complete and job well done.
+5 medals: Excellent work, you’ve earned a promotion.
+10 medals: This might be the best planet we’ve seen yet.
+15 medals: All stars have aligned because of you, Planeteer.
---
There are also several tables in the section above which are completely screwed up when I try to copy/paste them from PDF file and I'm too lazy to format them myself or too paranoid to take a screenshot and upload it to some shady pic sharing site like Imgur

. Basically, red and orange alerts lower the final target score while green ones raise it.
My personal best score was 88 playing Makeshift guys (whom I find extremely OP) on Charybdis on my third playthrough. However, this was not a "proper" solo playthrough (I played it with no events which SHOULD be included in solo mode as per the rules as I've found out afterwards). Since I've started to always include events, I was nowhere near that result: 30+ or 40+ is my usual result

. Events really screw you up. In my perfect playthrough I mentioned above I managed to max out my planet (40 pts) and 3 trackers (15 pts), satisfied all 3 personal goals (15 pts), collected all 6 pods, a lot of meteorites and some more civ points. When playing with events, 90% of the time you have to throw one of your personal objectives out of the window, you lose some pods and meteorites and regress on your tracks heavily. But the main problem with events is that the game is limited to 20 turns, because when you run out of all 20 events it's a game over. This prevents you from completing your planet. In my perfect playthrough with no events I was able to lay down 23 tiles, which is obviously almost impossible with 20 turns.