We had a lot of trouble balancing that in the last 1-2 hours before the deadline. It's actually WAY bigger of a hitbox than it looks like, we increased it 3 separate times but the trouble seems to lie on the speed it comes at you. Our discussed solution was to have a button you could press at anytime to open the next visible door, so it still relies on reflexes, but doesn't require that much precision.
And thank you for you feedback!