I haven't done it but with cheated max stats i think it's def possible to "win" Rivers minigame, 2 times reached full bar but nor lotty top animation
My strat is to just stay dom as long as possible until light pink in close to full so that once you frame perfect run out of stamina in sub, River speedruns you so you end up with left over Purple bar to sit in dom earlier n longer
But with future updates there prob will be something that boosts stats further so it won't be nearly impossible anymore, love this
also would be nice if there was extra dialogue for reaching this "100%", reaching ~80 just gives the same result