Thanks for the feedback! That behavior is intentional, but very good to know that comes across as buggy. The camera centers on the player so the whole level isn't always visible, requiring you to move around.
I think there actually is some sort of bug here. I popped back into the game to grab another screenshot. Notice that the player is nearly off the screen.
Tested in Firefox this time. It may be relevant that I'm playing on a Macbook Pro with a high DPI display.