I like the game, it kept me busy for a few minutes. I feel like this game has alot of potential. It becomes clear very fast what the objective is. I think it would have more replay value if there was a visible score system during the game, instructions/objective list, and music (The music stops as soon as the level begins). I didn't know what was trying to kill me and what was there to help me, I jumped into the spawner thinking it would take me to a new level, and I ran away from the shield thinking it was going to explode like the yellow dots. All things considered though, if this had more to it, I think you'd have a great yet simple game on your hands.
If I may also suggest, the Newgrounds scoring system may help out too if you can intertwine it together. I would like to compete against other players scores which would add to the replay value.