Has a retro feel, for sure!
The sound design is very good, although the background music is a bit too far in the background. Making it a bit louder wouldn't hurt. In some places it felt like I had to tank damage to get from one place to the other because the enemies left too little space for me to squeeze through. Or would just take forever to go all the way there aaaand all the way back. Might as well just ram that ape and get my bananas faster :D Neither very hard, nor too easy - and that's something to be proud of, because poor balancing ruins a lot of jam entries.
I really enjoyed the graphics - very simple, but the monkeys are very monkey in nature. Love that you used bananas for life. Because bananas for life and return to monke.