All those different TDs on the market and you don't do anything new. I'd say you don't even do the old mechanics well enough.
Perspective is weird, especially with how high the towers tend to be. Placed archers on the ground instead of tower and didn't notice it until they got killed. Can't rotate camera. No progression - you either beat the level, or you don't. No extra money for kills, just build something and see if it works. Enemies just rush in one after one, and then start pathfinding, sometimes crowding when there's an obstacle like the knight.
No idea what's the different between an archer and a crossbow guy. Knights get overrun very fast. Some areas are unavailable for placing units, but you can build on them.
At least you didn't let me block off the ending. That's the only positive I can find.