This is a game for the Pixelated Scratch design studio. To play, click unoccupied green squares to gain some population, press Space to start a battle where you can claim some of the Chicken Empire's (the dark blue squares) land but they can take yours as well and you lose a few people as well. The empire with the most territory wins and sirens mean a battle is underway...
Do not try any of this at home or anywhere else and no advertisements please but if you really must, go here and do it: https://scratch.mit.edu/projects/1260530154/ Fun fact: The pixels are all just a single costume