Yes, if you just increase the saturation on the picture you get the more normal color palette:
https://i.imgur.com/ms2OYGD.png
I've always been a bit surprised that the cum looked very yellow-ish now that explains why... personally after thought I actually prefer the "pale" version.
Any reason why you draw the whole picture first then increase the saturation LAGS? I would have assumed it's easier to select the saturated colors first when you draw the picture?
EDIT: the "pale" ones would actually look very good for a "GAME OVER" screen. Since you have both versions and need to store 2 png's anyway for the cum/non_cum variants, I suggest to do like this: have the non-cum version with the warm colors, and the cum version with the pale colors. It would make a nice contrast between both, like the "cum" version is after game over or something. Maybe add GAME OVER on top of the pale one and please also don't forget to display them in-game when the player loses!! (say 3 sec after death if the player has no potion left and an enemy is fuching her).