I really liked the mechanics with the gun and how it was used to interact in multiple ways. It was a little hard to fully grasp how to exactly solve each puzzle with the gun, as some of the solutions did not seem intuitive at first. However, I found that some of the challenges can actually be solved in several ways. As you try enough times, you get the hang of how the mechanics work and how they can be used in the specific situation, which works well overall.
The graphics were good and the audio and us thereof too.
Not much story-wise as of yet, and story does not seems to be a necessity to this game, but would add some nice depth to the environment.
Overall a fun game. It can be a bit frustrating as it is somewhat difficult, this is however exactly what a lot of players seek, so this does in no way lower the overall quality of the game. Great work!
-BH