Very nice puzzles with clever design. Took me a while to get it but was a nice challenge. Graphics were okay but could use some improvements. I think the detail of the weapons is nor consistent with the rest of the game. The switch to the second part of the game with the shooting changes the type of the game what i think could be problematic. Would be nice to have at least a checkoint there, so you don't have to go through all the puzzles again.
I enjoyed the puzzles very much, so well done!