The hitbox is smaller than it looks, so sometimes you can graze past a shot that looks like it hit.
You should still be able to move during most of the damage animation, just not shoot... that might be a bug. What browser are you using, and how consistently is it happening?
Viewing post in Suzieus: One Doll Survives jam comments
Thank you for the report! I can't reproduce this after multiple attempts, and I can't see any place in the code that would cause this. It's possible that I've missed something. It's also possible you thought you weren't moving when you were because of the damage animation style, or you were near the edge of the screen and trying to move outside the play area, or you happened to have an unrelated keyboard problem at the same time you got hit. If it's definitely not any of those, a video of it happening might help me narrow down the problem.