I like this! It got addictive very quickly. Some critique is that moving through the map is pretty slow and tedious. Also, the player wasn't notified when the game was complete. After I finished the third level, I was trying to navigate the map finding more land, and the slow motion mechanics made it a little frustrating. Also, the design for the third level is a bit underwhelming. A majority of the gameplay for that level has no enemies, turning conquering into busywork, and once you reach the enemies there aren't a lot of necessary tiles.
Something I really liked is that you introduced the mechanics through the menu!!