Active-Idle

Not bad, but overall it's a very static game. If possible, you might provide a backdrop or some other indicator of the character's scale as he grows. Secondarily, you might consider some indicator of wealth, but that's obviously a bit more abstract.

This game has huge potential, right now i can see it as the first stage of a great game. ''half the size of the statue of liberty'' is indeed a good marker for the first tier of prestige. then after that, you can think about ''size of (city)'' and ''size of (country)''. with some background changes of course because you can't be as big as a country while still walking among buildings

Nice and original idea, I really liked it, you should add also a sort of mutation od the species so the game can evolve for more time before having prestige.
You could also allow to have more prestige points in order to spend them upgrading only one button instead of all of them

Prestige 667... I can almost instantly end my prestige by just mashing MGH.

Unless I'm super oblivious, would be nice to know when a Prestige was coming instead of it just randomly telling me I'm prestiging. (apparently prestiging isn't a word? who knew?)