Interesting entry! I havent' seen much sidescrolling beat-em-ups in a while! The concept of transforming into a wereduck is really cool (an on theme for the main requirement and all wildcards, clever!)
Music was great, really catchy!
In terms of gameplay, its not immediately clear to me how the 3 attacks differed. Perhaps having more powerful attacks on longer cooldown might encourage players to switch up their strategy. Right now, spamming jab seems to be the best way to progress. The hitboxs on the uppercut seemed shorter and harder to land.
There also isn't a clear incentive to transform into a wereduck. On top of losing health, you also do not feel substantially stronger. Perhaps a more powerful wereduck form would encourage players to switch more often.
Nonetheless, a solid entry!