Now that I've beaten 100 extreme demons, here are my thoughts on all of them.
(timestamps at the bottom of description if chapters don't work because there's like a million of them)

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0:31 - Cataclysm (1)
0:56 - Hypersonic (2)
1:14 - Killbot (3)
1:51 - Auditory Breaker (4)
2:15 - Zettabyte (5)
2:27 - Sakupen Hell (6)
2:39 - Bloodbath (7)
2:45 - Volume (8)
2:57 - Prismatic Haze (9)
3:22 - Kenos (10)
3:57 - Acu (11)
4:17 - TANTRUM (12)
4:23 - Blade of Justice (13)
4:48 - Carnage Mode (14)
4:59 - Limitless (15)
5:16 - Yatagarasu (16)
5:27 - Black Blizzard (17)
5:52 - Erebus (18)
6:13 - Sonic Wave (19)
6:25 - Deception Dive (20)
6:38 - Epsilon (21)
7:23 - Hateful Reflection (22)
7:38 - Fusion Z (23)
7:53 - Glide (24)
8:11 - Cognition (25)
8:43 - Ithacropolis (26)
8:52 - 8o X (27)
9:16 - Faith (28)
9:23 - Diligence (29)
9:54 - Aftermath (30)
10:06 - Devil Vortex (31)
10:17 - Cold Sweat (32)
10:53 - Maybe Possibly Thing (33)
11:01 - Just DANCE (34)
11:08 - Anoxysm (35)
11:20 - Conical Depression (36)
11:48 - Balengu Vortex (37)
12:00 - The Ultimate Phase (38)
12:19 - Athanatos (39)
12:50 - Bloodlust (40)
13:12 - Timor (41)
13:50 - Cybernetic Crescent (42)
14:45 - Crimson Planet (43)
15:11 - Lucid Chaos (44)
15:23 - Ziroikapi (45)
15:56 - Digital Descent (46)
16:10 - MadMansion (47)
16:21 - Necromancer (48)
16:29 - Artificial Ascent (49)
16:56 - The Golden (50)
17:29 - Tartarus (51)
18:06 - The Reaper (52)
18:27 - Omicron (53)
18:45 - Sonic Wave Rebirth (54)
19:46 - 2 1 1 (55)
19:51 - Altered Ascent (56)
20:05 - Paroxysm (57)
20:22 - Quantum Processing (58)
20:43 - Ragnarok (59)
21:23 - Sunset Sandstorm (60)
21:36 - Titan Complex (61)
21:53 - Unearthed (62)
22:09 - Keres (63)
22:31 - ErebuS (64)
22:41 - Visible Ray (65)
23:01 - Azurite (66)
23:17 - Wasureta (67)
23:26 - Gunslinga Corridor (68)
23:47 - xo (69)
24:05 - Zodiac (70)
24:26 - Nhelv (71)
24:49 - Napalm (72)
24:57 - Slaughterhouse (73)
25:28 - CYCLONE (74)
25:43 - Daydream (75)
25:52 - Falcon16 (76)
26:05 - Untitled (77)
26:14 - Down Bass (78)
26:25 - Artifice (79)
26:54 - Skrrah (80)
27:06 - SubSonic (81)
27:18 - Sakupen Circles (82)
27:43 - Renevant (83)
28:02 - Aerial Gleam (84)
28:15 - Calculator Core (85)
28:22 - Sigma (87)
28:31 - Omega (88)
28:42 - Gamma (86)
28:55 - Molten Core (89)
29:05 - Acheron (90)
29:35 - Aquatic Auroras (91)
29:40 - Frozen Cave (92)
29:53 - Spectrum Cyclone (93)
30:04 - Ouroboros (94)
30:12 - Arctic Lights (95)
30:24 - Deimos (96)
30:40 - SUPERHATEMEWORLD (97)
31:03 - qoUEO (98)
31:14 - arcturus (99)
31:24 - Silent clubstep (100)