I DID IT!
Finished my frikkin part, mans!
I know it's not the ultimate best animation in the world, but I'll call it a day.
Note for zeebra: for the fast moving background thing I kinda scaled a symbol to about 16000 px wide, which might cause trouble when trying to move the symbol by inputting values in the properties window. I had to look it up myself, but the solution seems to be to scale the width to 1px and then move it and then reset the width to the original.
(normally you don't need to move it, but just in case: sorry for the troubs)