Love the pixel art filter. Music and sound effects are great. Overall I had a great time playing it! I will say though, it wasn't completely obvious at first how to expand the map. I think it would really help if the border highlighted green when you hovered over it. One way I think you could make the premise a little more interesting is by allowing the player to choose different environments whenever they expand the map, kind of like a lava tile or an ice tile that changes the environment in some way. I give it a 4, 4, 4. Also, awesome name for the game.