I am on an iMac. Looking horizontally, W, S gives forward, backward (into the screen and out); A, D gives left, right; and E, Q give up, down, all as expected.
If I tilt the camera straight down, W, S give down, up, and A, D gives left, right as I would expect. However, I would expect E, Q to now give forward, backward (into the screen and out). However they give up, down not forward, backward. So there is no way to move in and out of the screen.
If I tilt the camera straight down, W, S give down, up, and A, D gives left, right as I would expect. However, I would expect E, Q to now give forward, backward (into the screen and out). However they give up, down not forward, backward. So there is no way to move in and out of the screen.