I played your game and is working well, heres my feedback...
- graphics look good, easy to see and understand
- i like how player has options like qwe etc to defend
- good sound effects
- music would help to add atmosphere
- it would be good to show units range when selected
- good strategy elements,.
- i like the fast forward and pause button, but id like to be able to build and examine when paused
- good controls, i like double click to build!
- lots of depth to this game, it is working nice.
- great to see it remembers progress so i can come back later to play again. :)