This has a neat concept. I had to take a moment to comprehend the core mechanic, but when I did it, I had a pretty good time trying to maneuver through the crates.
I think there needs to be more for the player to think about on the shooting side, since there's no point in aiming anywhere aside from right at the target. Maybe there could be some way to shoot again when in the middle of a stage, or maybe each stage has a certain amount of "fires" you can do throughout.
The crates catching on the side of the bullet, especially in the hallway did get a little frustrating. It just felt like the bullet got stuck too easily. I never got soft-locked by it, but it made it take bit longer to get through.
You definitely came up with a creative mechanic though, and I hope you continue expanding on this!