Thank you! :)
What do you mean by adding gravity? Is it about the character being too floaty? There actually is a gravity increase during the jump, it applies after he starts falling, but I probably should've moved that to an earlier point - this slow moment in the jump curve when the character reaches the highest point of the jump is what makes it feel floaty I think.
The keys are hidden. There are a couple of clues in the narration, as with everything else. Kinda vague, but still. One is above, one is below :)