Thanks for the feedback! Yeah, the limited shooting controls were unfortunately a result of me running out of time (I threw in the ctrl+dir stuff because I figured there should be some way to shoot things from the keyboard). A better approach would probably be something where you press a key (f?) and then move the cursor with your keyboard, with it automatically targeting a nearby enemy / the last enemy you aimed at, whatever.
I do plan on polishing this up and certainly fixing the difficulty balance, hopefully in the near future. At that time I will try to get some decent keyboard controls for 100% keyboard usage in there.