There shouldn't be a "fire button". Is there any advantage to not continuously firing at all times? I haven't seen better control, or aiming improvement in any form from not firing/choosing when to fire. It should just be auto fire on always.
There seems to be a bug....sometimes when I restart a mission, I can't play it. The mouse doesn't change from the normal arrow to the targeting arrow, the cursor keys don't move, and I can't press space to change weapons. The only thing I can do is pause the game, and select restart, or level select, but once a round starts this way, restarting or selecting another mission hasn't fixed the problem, just reloading the page helps.
I think the game would benefit from some more extensive labels/descriptions. When actually playing a level, there isn't any indication of what level you're playing. This hurts replayability...if you liked a particular previous level, it's sort of a trial and error situation to find that level again. This is made even worse since there isn't any real information when selecting what level to play. This would be nice for each level's "Normal Wave", but a useful description for the "Challenge" waves is absolutely necessary. It would be nice to know what upgrades are useless for the particular wave so you can redo your upgrades appropriately.
I have a 0% Threat Level, with +7% Growth, Outpost -5% and Militia -3% which would indicate the Threat Level will never go above 0%....why do I have to still do an outpost defense every 7 days or so there? You'd think your Outpost/Militia could deal with it on their own. It's just a time killer, WAY too monotonous. And @Nemoricus is completely right...upgrading factories isn't worth the effort either. Keep your Engineer as engineers, they make more profit daily as is...too many other upgrades necessary at the outpost to make up for the threat level increase if nothing else.
The game seems to have a flaw. When playing in fullscreen mode, I flew completely through the first region, and only saw about 5 tris. Playing in normal windowed mode, there are tris all over the place.
The weapons are simply out of whack. The rocket launcher is the first unlocked weapon, and is WAY better than anything else even if it is a little slower than the others; having massive area effect damage, infinite range and ammo. The least you could do to balance the game would be limit the number of shots with it. Once a weapon is acquired, you should be able to select the one you want to use. I often don't even notice the NPC has spoken until it's about to flash off the screen. And, as many people have already said: A map would be helpful, the soldiers shouldn't do as much damage as the mecha.
I agree with MadCrimson, there should be a way to upgrade from the level selection screen instead of actually having to start a level. I'm a little confused by the upgrading order. I can use my stars to get the basic turret upgrade, which gives me access to the rocket and laser turret upgrades, even if I don't have rocket or laser turrets yet...is there a point to using stars to access rocket (or laser) turret upgrade without having rocket (or laser) turrets?
As several people have said, the interface is poor/hot keys would be a major improvement. The sniper pirates seem to all shoot simultaneously, which is generally overkill of many of the enemies, therefore a waste of ammunition and targetting other enemies. The snipers shoot at bombs already being thrown into the ocean (again, a waste of ammo for them). When the birdbombers are shot by snipers, they don't drop bombs, which is very annoying when you were just about to cage one to drop it's bombs on enemies below.
If click and drag is too difficult to implement, at least hot keys for each squad would make it easier/faster to control your units. Definable hot keys for multiple squads would be even better.
Mental note to self: "Gotta remember to read those help files sooner next time."
I didn't know you could move the hero to the neutral towers, change the hot keys for your weapons, or NOT auto recruit soldiers until I was on the 25th level. DOH, my bad.
I didn't see anything in the help section about those giant axe wielding ogres, so here's my two bits to help others. You can shoot them in the chest when they raise their axe to strike, and shoot them in the head when they take off their helmet after striking. Explosive arrows in the face when the helmet is off knock them off their feet, so you might get in a few more head shots that way. Otherwise they seem to be immune to all weaponry and your shots just bounce off their armor, often hitting your own men.
Good game
 "Ragdoll Invaders")
 "City Siege Sniper")
 "Royal Squad")
 "Decision 3")
 "Full Moon")
 "Mechanical Commando")
 "Kill the Heroes")
 "Shore Siege!")
 "Hordes and Lords")
 "Bowmaster Prelude"){kind=icon}
That's for sure. But unfortunately I ran out of time and had to publish it as is.