This is a great idea for a game! I liked spreading around the map and figuring out strategies on faster spreading.
I wish there was more explanation of what counts as a wall, because i could not climb the wall as is pictured in the title icon of the game. Also around level 60, the cost gets too high too quickly, I always end up in a long corridor where I don't have any new food source.
Would love if there was a mode where it pauses automatically every turn, so i can pick what i want to do without rushing. But i understand you wanted to create a bit of pressure and chaos in the gameplay.
Overall, this is a good game, i would like to play an expanded version of this.