Played this, here's some feedback:
1: It's fine.
2: It's... kind of an annoying/boring jump if anything. I think it could be replaced with something more interesting.
3: It's extremely easy to cheat with single into double on the slant, with airpogo also being possible albeit pointless. Otherwise I guess it's fine. I think someone learning slants might struggle with the slant walls being a little too short in the height department (this also goes for the corner slant jumps later on, and applies more to them as well).
4: It's just way too easy. The tele isn't high enough to be a hindrance at all. It could use a buff.
5: Very easy to cheat the second 180 with a double from the previous wall. Just shorten the size of that wall. Otherwise it's fine.
6: It's fine but maybe a little too easy. Also think it could use a little buff to the playerclip. The slant jumps are just way harder in comparison.
7/8: They're fine. If anything I just think there could be a little more variety with the last 3 jumps being just two corners on atypical walls, but I understand this map is more of an introduction to these concepts.
9: It's fine besides it being possible to cheat as stated before. I don't think it's really harder than the other jumps or anything, and I suck at strafing.
10: It's fine. Good spacing to start the slant pogo here.
I also agree with 879m's sentiment that there's not enough holes in the map. And the hole thingy on jump 2 is just one sticky to the finish, you don't even need to do a wall transfer or anything.
As for the textures, I think they're fine, though maybe the map is just a tiny bit too dark? It's not really a big deal.