alright...
I'll try not to be overly critical considering this is a beta... but for fuck's sake, I shouted the circuits out of my computer out of sheer frustration! Why, you may ask? Actually, there aren't many reasons, but those are REALLY getting on my nerves.
The greatest one would be - hey, what's that sound of a tower building and WHY is my hard-earned cash replaced by "NAN"??? On certaion occasions, I click on a tower to upgrade it, but then it plays the aforementioned sound, and takes away ALL my money, for NO apparent reason. Now I've no idea what does this, but it sure is there, I got it at least a dozen times.
The second and third reasons are rather technical ones, concerning the splitting motherfuckers, which no matter how hard I try, there still remain like 10-15 of them by the waves' end. Either don't make them split TWICE, or at least give money for killing the smaller fuckers - like it would be normal, you know.
The third one concerns the towers and their prices. I found the anti-air towers costs disastrous - if you want to save up for two of them by the time they come, you'll stand no chance against ground troops. If it were me, I'd lower the costs and decrease effectiveness, but it's your game... And what's this, the first upgrade for the basic towers is more than the second? That's nonsense...
If it weren't for these (and there would be more levels, or a level editor), I'd consider BUYING this game like any other - you got a reeeeeeally good thing here, just try and clear up the mess and good times are abound ^_^