Player-controlled jets are the absolute best looking thing on screen while everything else is composed of a scant few polygons and looks incredibly flat. The train you have to chase down in the first level is little more than a few blocks on a rail, while most of the enemies you run into look like those foldable paper cut-out planes you can buy at book fairs. Not to say that the DS is a 3D beast, but it is certainly capable of better things than this.
Time Ace doesn't look good, but the developers should get credit for putting together a smooth-running 3D engine. There are a few noticeable graphical tricks going on to achieve this, like a limited draw distance, but I'll take cheap tricks over a choppy framerate.
Music is impressive and helps to make things feel more exciting than they really are. It feels like it should be in an Ace Combat game rather than an arcade shooter.