Nice
The concept is very good, however, it is a VERY easy game. The only hard levels are the last 2, and that's just because even with a lot of armor you die basically 1 hit. You should add more things to this, like speed, and make strategy more of a requirement for hard mode. I went through this only one time, and it was on hard mode, and I didn't struggle at all until the last few levels, and all those took was just a good start without an enemy spawning on me. All in all it you did a nice job.
~MadenameXD/Spiralz