No apologies here, the flick just feels so much more like a '70s picture, one of those last gasps of that era's cinema, like Heavy Metal.  I can't explain it any better than that, it's just the vibe I get from the movie.

Joey-"Ross, I've got a science question for you".
Ross-"Science. Yes,I've heard of that".
Joey-"If the homosapiens are in fact, HOMO-sapiens, is that why they're extinct?"
Ross-"Joey, homosapiens are people!"
Joey-"Hey, I'm not judgin'."