This is really good! Ducks are cute, I like the variations of the ducks and the look of each of them. The pacing of the game is also really good. I like the fact that it starts from just two basic ducks and slowly builds up your repertoire. It really makes the learning experience super smooth and gets the player up to speed really quickly. The power of each duck also clearly matches how it looks, which is a major plus. Gameplay-wise its also decent and enjoyable, with some quinten multiplayer magic that somehow got cast at a jam game, this is probably one of the better multiplayer autobattler you can get.
The only criticism I can think of is that the lack of sound effects for the ducks really hurts the game. Just feels like something was missing, especially with the nice background music you have there.
Anyway, this would probably make a really good mobile game. I like this a lot. Well done!