That was a very entertaining and humorous game. The monkey sound effects were my favorite part of the game, and the graphics and music really tie in together well. I really enjoyed the fast-paced gameplay, and it's fun growing more powerful and seeing all those banana projectiles fly around.
One thing I'd change is to make the collection area for the monkeys bigger, or make it so that you get a monkey if any of your monkeys come into contact with it. I would also add a health bar for the boss and some death or explosion particles for when it dies, since right now the game ends really abruptly.
Great job on the game, I had a lot of fun playing it!