Cast chance dosen't seem to update if you get enough int for a new point (at least from level up), equiping/unequping items with cast chance modifiers seems to fix this
1)Not sure if this is what gotoxy ment with max range possible, but Zakana towers seem unable to pass from a certain range. When you boost them, the circle keeps growing, but shoots disappear before reaching it's border. If this is intended it will be nice to know how much is that top range.2)Not sure of this one either, I have some rank 7 towers, and I haven't seen anything about that rank up button, ¿do they have to get enough exp for another level? Also the exp bar is always empty on my rank 7 towers (even if they gain exp) don't know if it's intended.
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The Zakana's and Scorpions do have a maximum range. Also the level 7 upgrade button is only for certain units.