I mean sure big boss battles sounds cool too, but I'd be way more into a game playing as Mr. Bunyan, starting off as a regular woods-guy, but steadily growing bigger and bigger as your legendary appetite for flapjacks grows and you axe-ing abilities are sharpened.

Even better, the industries grow and develop with you as you're able to supply them with an ever-increasing supply of lumber. Naturally though, you eventually get to the point where you are outstripping the regrowth programs, and you have to start wandering deeper into untamed wilds full of ever-more-vengeful crytpids that no longer have homes or natural resources to feed themselves and have turned to terrorizing human settlements to get by.

In the end, Bunyan's connection to the wild allows him to realize the extent of the devastation he has wrought upon the land, and he realizes the only way for the natural balance to be restored is to stop the logging altogether, which naturally makes him the enemy of the insatiable appetites of the humans and their industry (acting as a narrative parrelel to his own pancake dependency), turning them against him and making for cool new lumber-mechas to battle in the last stage of the game.

Even better, the player has the unspoken option to turn against human industry at any point in the game, but the battle gets harder and harder the longer you wait to pull the trigger, eventually just becoming nigh-impossible by the time the humans develop guns, bombs, drones etc. (The secret cheat code though is that you can collectivise and organize the other workers to join you and they can help you in the final struggle.)

So basically it's Katamari Damaci but played out in a reverse-Zelda BotW progression structure.