Several problems
The game was filled with a lot of really simple bugs that should easily have been noticed and fixed during development.
Bugs:
-The auto-turrets shoot at the corpses of your enemies.
-Upgrade text stays fixed to the menu when you switch to a different upgrade sub-menu.
-Can't switch between weapons. I had the initial laser and the blue one with the auto-component. Once I switched to that I was never able to switch back to the default laser (which is the best non-automatic weapon btw).
-You can move to the left when you're in the dream-reality state after each wave.
Just generally bad design:
-The reality patches you have to shoot are utterly pointless. They occur at the very start of the leve. You pop em then are done. What's the point?
-Terrible animation.
I could go on but I think you get the point.
This game would be passable if you had put any time at all into polish. Was this made on a really short deadline?