I reached level 4 and was very close to beating it. In my last run I was closest, but it seems very difficult. I started with speed, then attack, and then attack speed, and I call this strategy sniper monkey. Throwing the banana seems kinda hard to know when to do, I always expect it to boomerang too for some reason lol. Bullet distance seemed to be determined by speed as well (I assume it is timer based, and that is why, as opposed to distance based), otherwise I would say a bullet distance upgrade would be nice. Maybe add an explosiveness type upgrade to the banana throw to make it more useful. Looked great, and was quite fun. Nice concept too. I actually just replayed it to remember the audio and got level 5 lol, but the audio is simplistic, and nice, but not too much to it.