So how come you got such a relatively big score while using so much time?
Do you get a better score if soloing?
Yeah. Score points are awarded for two things - quest completion and experience gained from killing monsters. Together they're counted as fame. Quest completion difference between us is not as significant, though, as it's mostly the main questline that matters. Like, you've probably completed most of it but missed small stuff like becoming master bounty hunter or something.
When it comes to kill xps, solo probably doesn't matter. If it did, then I'd be having a much wider score gap - after all, I've took roughly 3.5 more time to finish the game while having only double the score so we're talking about 7x Fame difference (and score is fame/time). And we also have to account that, in faster scores, questing takes a heavier share in the score, and in slower scores it's much more about killcount.
By being level 200, I've raked least 5x more experience (I could've trained to lvl 250+, I think, so maybe up to 8) and if I was gaining 5x time the fame for being solo that'd be 25x(40x) difference - seems to big to cause only 2x score.
So I think it's more about having learning GM at level 20 which doubled all the kill XPs I was gaining. I probably could've pushed that score even higher if I ramped it up to 30 (or maybe 40, it's not like you need much outside of dark magic 40) and cleansed the earth plane more diligently (it's annoying but rather cost efficient). I also should've rushed the plane between planes access faster and cleansed that one too, I guess.
I could've also used Reanimate exploit, I guess. Once you have learning 30-40, it becomes viable - lure garrote gorge dragon to the temple, kill it, reanimate, instakill with shrapmetal, reanimate, instakill, repeat ad nauseam. In russian old school score play this stuff was banned though, even though it's stupid - that's the sole point of Reanimate spell.