I played all 20 levels and only lost 2 lives. Tower crituques...
Hellion Tower - Couldn't find a reasonable spot to place these to maximize their damage (assuming they work like the void ray). Change the map, increase their range or give them a debuff (like bleed or poison). Pretty useless IMO for these reasons (I built 3 anyways).
Cannon Tower - Costs less than Marine but does more damage (according to tooltips). I get how the damage works out to be less than the marines but it's just misleading. The majority of my towers were made up of cannons.
Marine Tower - Perfect except their damage tooltip can be misleading...not sure what you can do about that.
Zealot Tower - Im a fan of variety. Making another tower do the same thing only do more damage is a bit redundant. I could have gotten away without building any of these IMO. (I had 3 of these as well). Other than just adding a new tower with a higher cost and little more damage, I don't see the point of these.
Maruader Tower - Required IMO....abuse can make the map way too easy. They should do 0 damage and maybe take up a 1x2 'space'.
Ghost Tower - Awesome damage but I think their cost is too high considering their slow (too slow IMO) attack speed. The cons of the cost and attack speed outweight the pros of the range and damage.
Overall it was pretty fun. Its hard to say if any levels were too easy because there was no way that I saw to keep track of what level I was on. Even so, it felt balanced enough on each level but there was a 2 level spread where I had over 300 minerals and didn't need towers. I remember having to build towers frantically after that though so it felt balanced. I had a lot of unused space all 4 times I played though.
Aside from the odd unit names and lack of efficient tooltips, great job!
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I played all 20 levels and only lost 2 lives. Tower crituques...
Overall it was pretty fun. Its hard to say if any levels were too easy because there was no way that I saw to keep track of what level I was on. Even so, it felt balanced enough on each level but there was a 2 level spread where I had over 300 minerals and didn't need towers. I remember having to build towers frantically after that though so it felt balanced. I had a lot of unused space all 4 times I played though.
Aside from the odd unit names and lack of efficient tooltips, great job!