Looks great, it feels slightly weird to go from an ancient temple to (what I assume is) an abandoned military/research base so quickly but that's most likely just me.
And since you're offering, I do have some final questions...
-As a platformer, is there any "gimmick levels" we can expect, like ice physics, water and swimming, bounce pads or a vehicle section?
-Do both characters exist in-game or only the one chosen? Will the one that isn't chosen just not appear or can KoKo and Buka meet?
-Will the mature content still come from failure like the temple? With a health bar in play now I can see some being annoyed with having to drain it to see the scenes. A few games like this have a hotkey to make the character "vulnerable" in some way as a Quality of Life but I say a gallery is enough by itself.
That's all the questions I have. I am eagerly looking forward to the next project, and I know it will be a great one. Feel free to take your time, iron out any glitches and refine stuff until you feel it's ready, no pressure.