This is how shots (bullets) should work in games.
You die over and over again if you even try to get through without using RMB.
The concept is excellent. You should consider making a full-fledged game based on this mechanic, rather than just a corridor-style level.
This is a perfect example of how shots (bullets) ought to function—not dodging every single machine-gun round like you see even in AAA titles. The projectile speed should be exactly like this.