This is as close to perfect as a TD has ever been for me. The little changes are brilliant, and exactly what was missing from the original. Fantastic - I really hope to see others coming out in the future, with more skills, and maybe even more turret upgrades, or even if they're feeling like going crazy a new path. Literally the only thing this is missing is Kongragate achievements, but for once, that's not as big a deal in this case. :)
And a counter for how much starting money you're currently on in the War-Mart would be great, as would the ability to gain more money per kill like in the first.
The only thing it's really missing for me is a hotkey for sending the next wave, and hotkeys for upgrading. Also the wait is pretty irritating between waves. Great TD though :)
Wonderful game apart from the max level cap, which I find really irritating I have to say. I like to progress as far as possible in everything in a game. Still, that's just my opinion.
All it lacks is hotkeys for tower placement/spells, the ability to split music/sfx muting, and a reset skills button. Otherwise absolutely wonderful game - I'm hooked :D