Good tech demo!
I think the art style is sparse but fairly original and I enjoyed it more than I expected. With that in mind, I think you really need some more feedback for the player when shoots enemies. It needs to be onscreen, in the player's view, such as sparks, the enemy flashes red, hit sounds, smoke, an animation change, or all of the above. It'll help make it more impactful and rewarding when you're doing damage. Also the smaller black enemies were a little confusing. I was pretty sure at first they were just in the background. Maybe they could use some brighter highlights to show where they are. I liked the boss graphics... the big robo-shrimp is neat! I love the Darius.
I also enjoyed the music, but it stopped when I got to the boss (or got really quiet). That removed a lot of the excitement from the fight.
In addition to enemy hit feedback, I think the player needs better feedback when he dies. He seems to blink, but it's not very clear that he died. Even something so blunt as a message would help. But better would be explosions, etc.
Finally, I called it a demo, because it was only one level and didn't seem to exhibit any particularly differennt shooter abilities outside of having the different art style. I did enjoy the game and I think it was a good effort--don't get me wrong--but I think it could use a gameplay mechanic to set it apart (bombs, grabbing mechanic, teleportation, charge shot)--anything else in addition to shooting will help give your game more particular flavor. At least--I couldn't find anything. I tried all the other buttons during gameplay--maybe I missed something?
