There's literally a boss progression list in the OP.
Eye of Cthulhu
Eater of Worlds/Brain of Cthulhu
The Perforator/The Hive Mind
Wall of Flesh
The Destroyer/Skeletron Prime/The Twins
The Devourer of Gods
Braelor & Statis (WIP)
Andromeda (Martian Star Destroyer) (WIP, Space Boss)
Yharim, Lord of the Cosmos/Soul of Yharim (WIP)
Mega Mammoth Dragon (WIP, Superboss)
Xeroc (WIP, Superboss)
This is in the OP (In Planned Boss Progression)
READ... I said I saw no line of progression in game if I had not checked here otherwise.........................Well I see no direct line of progression in boss fights in this mod and wouldn't have known otherwise if I had not checked here first. I ended up defeating Cryogen after defeating all mech bosses. I said it wasn't challenging as you pointed out, just pesky...
EDIT: I feel like you guys are trying to argue with me when I was giving my opinion on the matter.... You can't tell me I'm wrong if it's an opinion.