Nice and Simple
Gets repetetive after a while, and gets laggy even on the lowest setting. I agree with most of the others, the turrets should not be differently priced, at least not for paralell ones. Also, some method of selling would be very useful.
rubbish
one of the worst games i have ever played
Quite alright
A game with a somewhat relaxing pace. Graphics are fairly standard. Not stunning, but not anything to complain about (though visible defenses instead of red dots would be nice).
As others have mentioned, there's really no sense in the odd pricing of weapon slots. They should be equally priced somehow. The slots higher up seem to have lower range as well, so at some point, they may be worth less, but that may just be a personal opinion. Having weapons with lower range to knock off enemies getting too close seems to be a good idea sometimes.
I'd wish if there were a way to decide how the defenses chose targets. Currently, it looks like they will target the toughest enemies in range first. A way to toggle between weakest, strongest, closest and farthest for each slot would be a nice addition. I sometimes found it frustrating when my weapons would target the strongest enemies that took longer time to kill, leaving the weaker ones with more time to attack (especially while having machine-guns against armored units - there seems to be some sort of armor-rule).
I think it would be VERY important to stress unlocking new weapons. Unlocking a new weapon and upgrading the power plant in order to cope with the demand is both more efficient AND cheaper than sticking with the basic guns and boosting them.
This is by far the key to overcome level 2. Buy the cannon as soon as possible, and set it together with a basic gun as secondary on the right side (the gun is a backup in the beginning, since the cannon is slow. Replace with triple gun later, if you see fit). Upgrade the slots' damage by one or two, and then just pump up its fire-rate. Once fast enough, nothing will get past the splash-damage.
Place guns/triple guns on the left side against infantry, and put two'ish upgrades at fire-rate and damage.
Glitches
Kinda fun but very slow and simple.
I experienced the same problems as haehyun. On the seventh lave of level 2, the artillery side was untouchable. They took zero damage while still doing damage to me. It was rather irritating.
OK Game
Not to bad, could use some improvements, but all in all good idea for defense