Interesting game with good music which makes for a great atmosphere.
Movement could be made a bit more fluent and the world could fit a bit better for the grid system. Over all this is a great start to build upon. One game that this makes me recall is the "Robots And Zombies" by Rebello from 3 years ago. LINK to Jam Entry
Maybe have a look at it for more inspirations.
With a few adjustments it would become a great game!
When you run out of time you can still move around and the QUIT and Rstart buttons do not work.
Keep at it!