Add a ceiling. I was falling into the void.

it is indeed quite nice

a few suggestions:
- add an impact resolution collision algorithm so that players can slide on walls rather than just be blocked when a collision happens.
- add arrow key controls for non-querty keyboards.
- add some bobbing to the camera

For me, whenever I'm moving with wasd (and for about 0.5 seconds afterwards) I cannot use my mouse to change my view. If it makes any difference I'm using a trackpad on a laptop using google chrome.

For me, whenever I'm moving with wasd (and for about 0.5 seconds afterwards) I cannot use my mouse to change my view. If it makes any difference I'm using a trackpad on a laptop using google chrome.

That's actually likely something your OS is doing--disabling the trackpad while using the keys
C.f. this superuser post: https://superuser.com/questions/504571/use-touchpad-while-typing

Looking pretty awesome!