Initially I wanted to go all classic Doom style controls: W/S - move forward/backward and A/D to move camera left/right. But then wanted a bit more dynamic combat (player should be able to strafe) so switched to using mouse for left/right rotation. Also considering there are no elevations on the level, I thought not being able to look up/down would be interesting experiment. Technically the game plays well with top down view as well, so at some point I even considered ability to switch camera between fp camera and top down one. Overall I tried to have some combination of classic Doom and Dusk or Devil Daggers, but I have never done a 3d game with bevy before + my artistic skills are not good enough to be done in 8 days.