Really cool game with a lot of polish that went in, love all the little touches like the heartbeat effect when you're angry / low life, the slime trails everywhere, and how the enemies will go after you if you attack them outside of their vision radius. The explosive birds are also a great design idea, and when you started mixing all the mechanics together it's where the game really started picking up steam for me.
The only 2 critics I have is that 1 - I think I realized the snail enemies protected themselves only for the final level, before that I was kind of like "hmm this is buggy". So making it clearer with either a more visible animation or a color change would've helped a lot and 2 - I think the main character doesn't have a lot of personality compared to say, the birds or the rabbits? It's pretty much a blob that's spiky or blocky, and I think you really have something cool you can play with here considering the defense mechanics.
I'd love to see a version where you have more variety / powerups for your own attacks too, but considering the time you had, I'm impressed you managed to make something so coherent all by yourself. Kudos to you! Really cool game :)