Best-looking game I've played so far this jam, really an incredible job on the visuals. Both in using the engine very well and in the art assets if you made them yourselves. Music and sounds were also very nice and fitting.
The gameplay I thought was more of a mixed bag from my perspective. Incredibly ambitious to attempt a full 3D platformer like this, so high marks for shooting high, and sometimes I really liked it, but I often did find it frustrating. I was able to complete the first level without too many frustrations, and I do like hard games, so I didn't mind having to re-try a lot as I got toward the end and the difficulty ramped up. The second level, I tried dozens of times to get past the first banana and just couldn't figure it out, most of the time I'd die on the first set of spikes because the banana invincibility ran out so fast, but even when I managed to jump off it in time, I couldn't figure out where to jump to next and would just fall in the water and die. Eventually I had to give up. I feel like I was maybe missing something, but when I tried to look around while making the jumps I couldn't figure it out.
The third level was a lot better again, but when I got to the section with the two fists slamming together, I could get past the falling balls and the twin bananas, but the next platforming section I kept running into stalactites and falling to my death. Again, a couple dozen tries or so and I had to give up, but the level was really cool up to that point.
Aside from that, I'd also suggest lowering the camera sensitivity for controllers a bit, as it was extremely twitchy. And the grapple hook tail mechanic, while cool, seemed very dependent on how you entered into the jump and hard to predict where the monkey would go, so could maybe use some fine-tuning there as well.
With all of that said, I think this might be the most ambitious game I've played in this jam, and I think it is amazing the amount of great-looking content and interesting mechanics you were able to put into this thing. I'm guessing you just ran out of time to really polish up the level design and mechanics, which I totally get. You also hit the theme really well so high marks for that.
Incredible work!