Auto save function would be nice. Also, you can get your manual clicks by simply pressing tab until you highlight the item you need to click, then hold down enter.
When you get a chest battlefield, it would be good if there were enough of one colour to fullfill the key requirements!
Also, why doesn't the enermy shield depreciate the same as our own? I.e. he blocks 50% then 100% of our attacks?
Not a bad idea, but it is too short IMHO. I think it would have made it better if it were a full on launch - upgrade game. As it is, it's not a bad concept.
It have auto-save