Great, just great!
Excellent work, the upgrade system is fantastic! Although it got real easy real fast once I got automatic weapons. The turrets were nicely balanced, and I loved the way you had to construct your base before you could take shelter in it. The wole time system was well worked out.
However I did every once in a while have a problem after buying guns, the tiles showing upcoming events would disappear. The events would continue regardless but I wouldn't be able to see what was coming until the new ones came on the bar.
Overall, a great effort and a great game!