Had this had been made in the 80's or 90's, this would've made a killing in the arcades one quarter at a time.
While a simple interpretation of shapeshifting, the choice of turning into one of three ships is crucial to the survival of your character.
The vector-style graphics are very reminiscent of Atarti games like Tempest. It gives a nice arcade look to an arcade style game.
The sound keeps with the arcade feel, with retro-style chiptunes and 8-bit sound effects.
At first, I thought this would control like Asteroids, where you rotate with left and right and use up to accelerate. While this isn't the case, the fact that you only face forward add a depth of difficulty it wouldn't have. It might be artificial difficulty, but it's along the same lines of games like Centipede.
This is one of the best LD35 games I've played. While it still has its flaws, it's a damn good arcade shooter. Nice work!