Ha, I also realized that you technically reach the end game without the boost, but I didn't realized that it would also prevent you from getting the Blunk. I am currently working on a new patch to make boost power-up mandatory, and also adding some instruction along with it. Just a note, the goo can be frozen with the chicken, my apologies this was not explained anywhere in the game, I will also try to resolve that with the patch.
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Yeah, it wasn't made clear at all that the chicken could freeze the goo--I assumed since you could easily jump over the goo puddles in the beginning with the chicken that's how it was helping you. So is the intended way to get across the bridge with the goo pillar freeze it, then boost through it? I don't see any other way the lack of boost would gate me from the end of the game.