Bad dupe of existing games, but I can't find any evidence of it being stolen. yaykitties? Sure, it's been spammed to every games site out there (and blammed on Newgrounds) but that doesn't make it stolen.
And a real bug: keep a unit selected at the end of a level; you still have the unit selection box at the start of the next level (for a unit that no longer exists). Sell -> gold goes to NaN.
Also bug: you can't sell units in the last wave (may be a game design decision, since that would let you sell expensive units that the boss has already passed by).
.. boring. buildfest indeed. after a little struggle in level 1, you just keep planting a dragon. Up to level 5 at least nothing gets past a dragon. 2/5 for such simple "strategy".
music is nice; gameplay is annoyingly buggy in places (click to lose, for instance; no cursor drawn immediately). But basically a kind of uninspired avoider.
what makes DTD so nice to play is the keyboard shortcuts; with all of them missing this becomes slightly annoying to play. upgrades and next level are really missing.