and I have more to say, sorry. I think more stats is a good idea, however, I'm not as sure about the whole levelling up thing. juice fountains are pretty crucial, and I think that the new form of levelling up would be even easier to get super OP fast, because using juice requires players to go out and explore for new things. I think infinite stat scaling would be awesome, and like you said, have enemies and bosses stat scale with the player, that'd be pretty cool. that, and I feel like juice fountains are more.. satisfying? I guess that's ONE way of wording it, but I can't think of many other ways to put it. Like if a player is just wandering around, and it says 'movement stat leveled up' or something, they'll be "Oh yeah, that's cool." but with juice fountains, it's more of "Oh yeah, I'm levelling up now, this is sick." because players can see and interact with their progress. As juicefiend and terraformtrent above me said, it takes the ability to customize stats away, and players may feel that they've been cheated of creative value. another thing on this topic, I think that having weapons only be available to higher level players is great, but I could see how many others would find it frustrating. I think having new stats and character classes is a GREAT idea, but I can agree with many others that juice fountains are more intuitive and fun, although maybe these 5 new stats you propose could be levelled by just doing them. eg: get muscle by fighting, get brains by finding new things, get sense by not being ass at the game (like I am,) get spirit by [???] and get haste by running and jumping, or if haste means breaking things in the future, then by breaking things.
I think a stat rework would be pog, but I see many downsides to the idea of having stats scale with in-game progress, and I think it might lower the creative and willy nilly free-will ideologies of Juice World. TL;DR, Base stats would be cool, but Juice Fountains should be used for upgrades, not XP.