>>37359
A good stick (like N64/PS1 stick or arcade quality stuff, perhaps an old Atari or Amiga stick) or a dpad as rigid as the NES or similar would be a good substitute for KB.
Avoid "sticky" dpads like the ones on PlayStation/Xbox controllers, it's a joke to even try to play something like this on that, i sometimes wonder why gems like gradius are developed for those... Disgusting. Anyway the tackier they are the better as you get more control on your movement. Avoid slippery sticks, having it move at a certain unwanted direction will spell your death.