Dude. Production on this one is your best by far.
Here's a section-by-section breakdown with my thoughts as an engineer.
0:00: You have a nice mix in the whole intro
0:32: That kick sounds π
0:48: Nice mix here
0:51: The mix drowns out the drums a bit, I'd work on leveling this part to make sure the drums punch a bit more.
1:14-2:23: Nice change up, and then build
2:24: Again, drums are buried a bit, and the whole mix is a bit muddy in the low/ mid-low end, with all the instruments/drums fighting for that frequency range
Solid outro
I might boost the high-end on the whole mix, but you do have a nice dark theme going here, and it works really well. It's one of those things that you'd have to try, and then see how you feel about it.
Again, this is definitely your best so far, as far as overall mix quality. I know you're limited with garage band, but this is solid for sure.
Good luck with the GD Whitelist, and keep up the good work man!