I loved your game. Let me say that again. I LOVE your game.
The basic mechanic is very good, the concept is awesome. I love the aesthetics too, very appropriate and accurate.
I agree with dop2000 that there are some interface problems, but they're definitely easy to solve. I disagree in terms of difficulty, since I found it quite easy. But I understand in a full game you would gradually increase the difficulty.
Overall, it's a very cool game and I'd definitely play it. There is some improvement needed to make it a viable product. I could help you on private if you want, since I'm a professional game designer with around 15 years in the industry and I might have some valuable tips to share.
Well done!
Cheers!