not bad, here are some things that would realy help though.
A toggleable auto upgrade, clicking each tower to upgrade can be a bit of a pain especialy in leter levels, would me much more convenent to be able to drop a tower and have it upgrade to max on its own if I have the cash. hotkeys for upgrades woulnt be amiss either
Being able to see an enemies health points and armor value when you click on em.
An auto fire for nukes and weather (as a side note, only nukes seamed usefull for clearing masses of smaller things)
Also either the hazard ability of missiles/artilery doesnt work or its just not visualy displayed well.
And a graphics quality controll, i made it to lvl 27 of infanate till i laged out
A bestiary is something i tend to personaly enjoy, as well as some documentation on how different skills work (such as crits, and armor destruction, does it stack or just take the greatest, how armor actualy works, etc)
As I said, good game, but the above would add polish.
to 150, when your at the high tree house stand on the platform, hit the blue switch, then jump from the paltform to the roof, there is a jump pad that will take you across the chasm fast enouph to get the last battery