I have to admit the game was a lot of fun, I played through the whole thing in a sitting, the power ups where one of the most fun things in the game, Would have liked the story to be integrated into the game, but I know with time constrains is difficult, the art was really good, loved the pixel art, the buildings were cool :O
Would have liked the bases to be a bit more easy to find, maybe have them laid out near the roads more often, as for the enemy ai, would be cool if had a range at which they started attacking instead of just swarming XD it led me to pile them up all in an area and finish them, also the weapons balance is a bit off, the heavy rifle is by far the strongest from the pack, and as for music and sound effects I think it still needs more work, but so far I really liked what you presented though it was fun :D