This was fun! Here's my feedback:
Sometimes the controls didn't really work, so I had to end the turn sooner than I wanted to. The blue text is also very hard to read on the black background. The Escpape key shouldn't really be used because it closes the full screen mode in most browsers. Finally, the positions (the green and red tiles) were working most the time, but not always unfortunately.
But those are some small points that I bet with a bit of polish could improve the game a lot! Nice entry :)