Sorry to be harsh, but I have to agree with ovi256, I don't think your app looks beautiful. In particular, your fonts look boring (Arial?), there needs to be some small padding for the ingredients on the Random page, the neon-lighting on the borders looks a bit ugly, too many different colors seem to used on various pages....

I am not a designer, but you should get one to give you some suggestions. In any case, I just bought your app......happy to help out a fellow HN-er :) Hopefully this will help improve my cocktail-making skills.

PS> Check out a book called Tapworthy.