It's ok
As people have already said money is sort of an issue early on when you can build/upgrade 1 turret every 5 levels or so, but after like wave 40 the money pours in that you can build lots of turrets.
There seems to be one odd glitch or bug in which if you hit roughly $500 you just lose like almost all of it by just selecting a unit or doing nothing without doing anything to the turret like upgrading it.
It could a better game if this bug/glitch was fixed.
Too slow.
You earn money extremely slowly and the difficulty ramps up very slowly. It's a boring game because nothing happens.
I suggest you use smaller upgrades. That will allow the person to have some input. You should make it so that each wave gives enough money for one or more upgrades.
The lack of saves is unhelpful with a game this long.
MONEY!!!
Great game, love everything about it. The way it warns you about air troops is good.
But the money...
As everyone else has said, getting money is way too slow.
it needs to raise at least $1 per round or something, and Elite's need to give a min of $50.
Got very few turrets up, and it made it very annoying after hitting round 50 because I had to build more turrets, instead of being able to upgrade.
Please fix this asap.
neeto
i pity the foo who steal mah gold, lol, got gold, TOO easy
money
need more money its to long to get money