Awesome little game. Fantastic effort in 72 hours, seriously. Getting the dice mechanic to work so well makes this entire experience work, and the graphics are funny, loved the different characters and enemies. Music also made me laugh, it's great and feels over the top. I think you should carry on with this theme, and so make the level design way more over the top to match the music. Like crazy maps, with, say, volcanoes erupting, or buildings collapsing or something. Just carnage everywhere as your little duck guy blasts away :D
Main criticism is the bullets and gun fire. The blue is way too hard to see against the green. Like I say, I'd have maybe a grey, cityscape type background, or rocks and stone, and use maybe red gun sights and orangey red bullets etc etc
Just a suggestion, but a great effort - very well done :D