I got stuck at the bottom of a shallow pit and could not jump out. There were several ledges I would get stuck on and be unable to jump, but was able to fix that by dropping down and jumping back up. Unfortunately there was nowhere to fall to from here.
Later I left the cave assuming I could climb up by jumping up above the cave entrance, but I guess the monkey is the last stage? I mean, the name of the game should be a clue I guess...
Great idea to have the adaptive soundtrack. The different stages work well, but the melody becomes very repetitive. It might be nice to have some sections where the melody instrument drops out and leaves room for the accompaniment, or to have a contrasting B section for more variety.
The visuals are charming, but I think the DNA could be made more obviously an interactable pick-up, whether through animation, a glow or particle system, or better contrast between background, platforms and collectable objects etc.
A final improvement to make would be a final win condition. Maybe there is one I didn't find?
Fun stuff. Good job, and thanks for sharing!