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The Great Old One Boss battle at the end of the Arctic Levels is bugged. This bug started back in the 1.0.4 series of patches and has continued on to the 1.0.5 series.

The smaller tentacles that you are supposed to destroy before the main tentacle are not destructible. You can shoot them, and damage them, but they are never destroyed. This makes it hard for the player to know which tentacles are left to destroy before moving on to the main tentacle.

Also, the fireballs/projectiles that the smaller tentacles launch at the player never move towards the player. They just hover and stack over the launching tentacle's head. Depending on the difficulty level of the game, and how many projectiles have stacked, this is instant death for a player who strays to close to them.

Attached is a screen shot, showing what is going on.
Attachments:
Fixed in 1.0.5.9. Just played through the level after the patch. Worked as expected.