Since it's a DDA.
It's too boring. You just go in circles and there are no close calls. Gold delay is generally a bad idea. So are launch-pad DDAs.
Mines in DDAs are generally useless since, if the DDA is any good we already know there's no way the ninja'll hit them.
The floorguards do nothing
Good DDAs need to be somewhat unpredictable (closecalls) I could predict what was going to happen just from the thumbnail. It's also much better to have just one well placed enemy instead of lots of ineffective ones (the gausses). They just kind of reduce the effect, add to loading time and lag.
Also, since you do nothing in the map, it's not exactly 'fun'

The tiles in the bottom left corner were kinda nice. Explore that style some more... With less objects.

(I hope you don't mind this humongous comment :))