Some major problems
It has potential, but the major problems are that the enemies are the same color of the background, making it very hard to see them, and the individual pieces lack detail all together. The controls are fine, but fix those graphical issues as it really hampers the gameplay.
Sucks
Theres no level progression, the triangles stop showing up after a while, and you should think about adding bonus or upgrades or something. Its really just a very poor 30 sec game.
If you would have actually played the game, then you would know that once you get to a certain score, like 200 on level 1, it goes to the next level.
Glitch?
After a while I eventually either couldn't see or they just weren't there, and so now I dislike the game :(. Maybe if the glitch was fixed and their were upgrades such as multi fire, etc.