Cave Boss

The Cave Boss is a huge, dangerous Box and the final boss of Episode 5 and of the game so far. He has rotating spikes when not stunned like the Factory Boss (though they only stop when he's damaged as this boss doesn't have a stunned phase) and is the largest boss in the game so far.

Behavior
Phase 1: The boss has a "neutral" face, then switch to his angry face and his spikes start spinning. He'll walk back and forth across the arena, moving slowly and shaking the screen with every step. The player must climb up the ladders on either side to hit small "falling rocks" icons, which drop a boulder on the center of the screen to hit the boss, which damages them. If he touches the player, it does 1 damage and the boss reverses direction.

Phase 2: After reaching half health, the boss will stop, right side up at the center of the arena. If he's at either side, the boss will leap without rotating himself to that spot, a move unique to this boss only. Then, he jumps and fires spike balls outwards when he lands. The player must run under the boss when he jumps and dodge the spikes to continue the fight. If the boss lands on the player, it kills them instantly.

Phase 3: After the boss loses all their health, they fall off the screen, and don't end the level like other bosses or explode like other boxes. The ladders at either side of the screen disappear and are replaced with spike ball shooters, and the Girlfriend is lowered from the ceiling in a cage. Keys then spawn on opposite sides of the arena with 3 in total, and must be collected to release her and win the level, while avoiding the spike balls.

Trivia

 * Cave Boss, Factory Boss, and Moon Boss are the only boxes to not to have pointy teeth.
 * It is possible that the boss's pose at the beginning of the level was meant to be a stunned pose but wasn't included for whichever reason. Neutralfaceiguess.png
 * Due to him not exploding in the level or in the ending cutscene, this could suggest that the boss isn't actually dead and may return later when the player is to slow at the keys
 * He is the largest boss out of all bosses.
 * He is the only boss that can't be hit normally.