Awesome idea that reminded me of my childhood. First time I wanted to see different animals, so the bees got me. The second time I tried spamming monkeys for ranged attacks + turtles for tanking the damage. The strat worked well until I got to the dinosaurs, they left me with 2 monkeys :(
Next wave of bears and eagles finished the job. I didn't see the endgame screen, the bears just went back outside the screen and I was left with a blank page. I realised I lost but not seeing the "Game Over" text made me feel a little better than the first time. Cool idea and execution!