Full insane mode playthrough as Gray Knight. He has the worst elemental punch, but he has arrow rain and bombs so he's not too bad.

Level timestamps:
0:00 Home Castle
1:36 Castle Keep
1:59 Barbarian War
5:05 Barbarian Boss
5:57 Forest Entrance
7:13 Thieves' Forest
11:58 Abandoned Mill
13:40 Rapids Ride
15:00 Catfish
16:03 Tall Grass Field
18:19 Pipistrello's Cave
19:57 Flowery Field
22:50 Wedding Crash
26:08 Parade
27:50 Cyclops' Cave
30:47 Cyclops' Gate
31:00 Cyclops' Fortress
35:30 Lava World
43:03 Industrial Castle
49:32 Dock
49:39 Pirate Ship
51:19 Desert
1:00:34 Alien Ship
1:02:27 Desert Chase
1:05:24 Sand Castle Interior
1:08:05 Sand Castle Roof
1:12:46 Marsh
1:24:50 Corn Boss
1:27:27 Flooded Temple
1:30:12 Medusa's Lair
1:37:45 Full Moon
1:48:40 Snow World
1:54:25 Ice Castle
2:02:24 Wizard Castle Takeoff
2:03:26 Wizard Castle Interior
2:11:42 Necromancer Room
2:20:34 Final Battle