I think it's a great game, especially considering it was made by just 2 people in a short amount of time. The visuals are simple but effective (I love pixel art). I also really liked the sound effects. The difficulty of the game can vary a lot depending on luck, I had some games where I had a bit more time to think because the zombies were walking all over the place. The typing at the end completely changes the gameplay, making it clear that you're facing a boss (RPG fan here), and that's really cool. And as a final comment, it made me think and sharpen my math skills.