The game's text and and look and feel is all very coherent and nice. I played the tutorial and it was good but i thought it took a little bit too long for enemies to spawn. Also, after the tutorial I played one more minute and had to quit because not enough was being thrown at me and i was typing strike over and over. Also the game took a super long time on the initial load.
Still you've got a nice foundation for a game here. Get more player feedback, implement more mechanics and I think you can have something really nice. Really good job! keep making games!