(Can't speak for the paid version since I generally don't buy full versions of games with bad demos.)

To start, the demo commits a pretty heinous "demo crime" of not being a vertical slice; there's not enough here to give anyone a reason to buy it, it's just a simple sex loop and a basic cum animation, and an absurd amount of grinding to unlock upgrades so you can grind more.

There's no bellies, no cumflation, no "Juiceflation" like the title suggests. I think maybe the worst part is that the actual idle/clicker part of the game is awful from what I can tell in the demo.
Upgrade clicks, or upgrade an autoclicker, and the autoclickers are basically worthless since they're hilariously slow, I mean "slower than if you casually sit there and half-ass some clicks" slow, even after fully upgrading it to the max.

Also there's this mechanic where a meter is there and fills up as you click, and when it's full, you can't earn money anymore. (Better not be idling or you'll just be wasting time!)
I ASSUME the meter's supposed to be a pressure meter for the inflation mechanic behind the paywall, but I can only guess.

Really I've got nothing good I CAN say about the demo, which sucks because demos are meant to tell the player what the game's going to be like and what they can expect from it, but all this demo does is show a basic, mouse-breaking, click-heavy, slow, and tedious game with a basic sex loop.

(EDIT: got curious and pirated it. Game's still not great regardless. As an idle game, it's one of the worst I've ever played, and it's driving me batty.)