The custom art looks great! One thing that threw me off about the game immediately was the odd control choices. I would recommend using spacebar for action as well as enter. U and J are also random keys to pick for switching characters. Because there are only two characters to switch to I would recommend one key to toggle between them or Q and E if you want to assign two different keys. The default character shoots very slow and I was killed the first time I played. I then found I could switch between the characters rapidly and keep shooting which made short work of the zombies! The short exploration phase at the end of the game was interesting but then it ends abruptly. It did put me in the mood for sushi though! Nice work and good use of the theme.