Gonna suggest buying a controller for PC. You can just purchase an Xbox controller and it's plug and play. If you have a ps4 controller it takes a slight workaround to USB it in but it's worth it.
I cant imagine trying to play super metroid with a keyboard
http://28.media.tumblr.com/tumblr_lcb35gGx0t1qailr4o1_500.gif
http://www.megavideo.com/?v=57N0YAEJ