It was an okay concept. Principle problems I came across:
1) Steering was bad and unresponsive.
2) You could only shoot in the cardinal directions, while enemy shooters could fire in 360 degrees.
3) Way too many layers. Made it difficult to see what was going on.
4) Finding the neon pink shadows of the scientists was difficult.
5) Considering the level of damage the monsters do to you, the complete lack of health upgrades seems like a glaring issue.
Keep trying, though!