I like the mashup idea, and the game's presentation is really nice. I like the character sprites, and the screenshake is weird, but combined with the sound effects, makes a unique 'feel' to the enemy ships. (Don't worry, not a bad kind of weird.) I also like that there are two modes, and that each mode has different options based on difficulty. However, while you did give a lot of different wrappers to experience the gameplay in, the gameplay itself was a little bit repetitive. I think this game could benefit a lot from having 2-3 more enemy ship types. Overall though, not bad!