Here's my review of the new 5 acts (includes revamped Green Peaks 1) + Arid Oasis:
Galaxy Forteress 1: No
CHECKPOINTS!!!!
I couldn't pass this act because of the big lack of checkpoints, and because of the awesomness dificulty that inhabitates this act.
Galaxy Forteress 2: no more lack of check points, thank god, unfortunately, like in act 1, it's so hard. Also, there's the script lump that's missing there.
GF Overall: Very good imagination and creation in the acts, but they are so hard that I had to use the "exitlevel command" to get out of them. 4/10
Alter Path: 2 words: short, and cheap: Short because, for beeing a "RIP-OFF of PAZ", it was very short. Cheap because that some platforms are too far away, and even spindash-jump lets you go "in front" of the selected platform, making you fall in the pit, and I died 4 times in that part (I know how to pass PAZ on hard mode, so don't call me as someone useless in platforming)
AP Overall: again, good imagination making a RIP-OFF of PAZ, but again, it's not enough. 3/10
"Super Sonic Zone" (I don't remember the zone name): Why do you give all the emeralds at that zone? Doesn't make sense, at all... Also, why are there turrets at the parts when you're in Super Sonic, still doesn't make sense... Also, you forgot to add 1 or 2 checkpoints, since it's obvious that it should have for a so long stage. Also, why Eggman has the same machine, it's just too easy, still doesn't make sense...
"SSZ" Overall: Very good stage, in terms of again, imagination, creation, and graphics. It's not that bad in terms of playing, but it's too easy, but I think it's enough for having a good note. 6/10
(New) Green Peaks 1: I appriciated, it's more bigger, and better, and it's enjoyable to play. But there's a little flaw, when you're at the tree, before the houses, you don't notice the red buzzes that comes at you, that's what happened to me, and I got hurt, take those 2 buzzes there, you don't really need of them here. 9,5/10
Arid Oasis (not new stage I know, but I wanted to rate this so meh): For a "mario mode stage", I think it's not bad, but it could be better, some enemy local's a bit cheap since it hurts when you come, also, when you thok, you usually bounce on enemies, and on these parts, you die in a pit because of the incontrolable thok-bounce trick. but the stage's not that bad. 7/10
Also, you still forgot to put Sand Kingdom 1 in the multiplayer level select, and to decrease the slime speed in Metal Mechanism 3.