Hi. Native Finnish here. I have couple of viewpoints:

"Lähti runnellen kasvos yksi tiistai" - I would translate this as "It left after mutiliating your face one Tuesday". This because "kasvos" has "-s" what is possessive form of you. Only thing I'm wondering if there's better translation in English for "mutiliating" (I'm not native). "it left your face ugly" would be good in Finnish but I don't know if this works in translation.

"surullinen minäkin oon, kun radallasi surumarssin, kanssas tanssin, tanssin" - This is tricky. If I was able to translate this freely I would translate this as "I'm sad too when I'm on your orbit dancing your funeral march with you, I'll dance" But this doesn't work becsause of linebreaks. Maybe
"I'm sad too,
when I'm on your orbit,
we'll dance your funerall march, we'll dance"
But as said this is tricky. This one has it's own flaws

"on tässä näin" - I read this one as refering to next line "KuuMaa" in a way that would be like "here it's hot (EarthMoon)" So I would translate it as "here it is"

"Jos vain auttaisin" - I would use "would" instead "could". I don't know how to explain this in English, but artist is passive actor here. They're singing like as for example if a medice would help in a headache. Both medicine and artist are passive actors in a sense

"vuokses keksisin" - here I would translate "For you, I would make up" In Finnish "want to" (tahtoa) lacks concreteness that this line would need and I would drop "it" because line is directly refering to "new law of nature"

"vaikka uuden luonnonlain" - Here "even" instead of "maybe". Line here isn't refering to possibility but exaggerates things that artist would do

"jos näin saisin uuden" - "If that way I'd get a new". In this line artist refering to time after inventing "new law of nature" and it just feels better this way

"ikuiseen piiloon panisin sen" - "into eternal hiding I would put it away" I liked translations before this line and I feel in this order this line would have same impact

"voi kuinka sitä vuokses vihaankaan" - "Oh, how much I hate it for you"

"uuden kauniin pinnan" - I really like choice of "person". It nicely blend metaphorical and literal meanings of the line. Finnish is singing about "surface" and I think "face" could be good as well. It could mean face of the object or of the person so it would have fitting double meaning. But I like more how direct the "person" is and it feels more fitting to Eppu Normaali

"silloin siitä kylläkin maksaa saa" - In Finnish, there is no generic you construction or in other words using "you" in a passive sentence in my head translates too easily to refering to not passive form. I would use "Then of course it would have to be paid for" Also "I" is the payer here, not "you"

"ethän, ethän, ethän sitä tahtoiskaan" - "please, please, please don't request it" because I read the line as persuasion because another choice is to wipe away the tears instead of artist being crushed

About the orbit thing. I don't know about it fitting in English but I would use it. This whole song is wordplay where "rata" is used in both literal and metaphorical meanings. "KuuMaa" (=EarthMoon) is a wordplay from "kuumaa" meaning "hot" (so "Love is hot"). There's so many choices made that points to that artist has wanted Finnish lyrics to be bit clumsy because of this double meaning. That's why I think literal orbit would honor the artist best

But yeah. These are just my thoughts and unfortunately English aren't my native language. I'm not tryining to nussia pilkkua so you don't have to take any corrections you don't feel like :D