The artstyle is superb. Absolutely A-grade quality of all assets, and the ducks are great!
The gameplay is a bit confusing. I see in the explanation what the ducks should do, but I couldn't really get it. On one level where I really needed to get higher I thought of using the trampoline duckling, but it didn't do anything, whatever I tried. Maybe I misinterpreted how it should work? Also, I get the GMTK shortcuts, but this results in controls being all over the place, which can be a bit annoying :P
I really see the possibilities in this game, and I think it would be a good one to flesh out more into a (little) full game.