Neat concept for a game. The idea of a fast paced shooter and a methodical puzzle game shouldn't mix, but it was interesting having to push blocks under pressure.
My major issue is that I wasn't sure what I had to recycle to win. I won after a while by just throwing in random blocks.
The time continuing in the shop is interesting, but I felt too stressed to think so I mostly just slapped on random weapons. Maybe time could keep going, but at half speed or something?
Other than that, the graphics look quite nice. I like the shadow effect. It adds a lot of depth to the visuals.