super polished and very cool idea!! i think you could totally build on this and i would love to see it,
duck level is definitely the hardest, and i think that might be because it's a little more luck-based than the others (or I'm just bad). The time that I won that level didn't feel like I did anything especially different than the other times I attempted, and it was really just because I got lucky duck placement.
I think if you expand on this, as a player I would prefer to either have the bomb timer OR the random running spurts in the enemies, not both. Having both makes it pretty hard to predict where your bomb will end up, making it more guessing than skill imo.
Still really really fun and I can't wait to see how you update it (if that's what you want to do!)