ur4guys: update ROM + refresh screenshot (#284)

New foe sprite art, foe/guy colour differentiation, centered default
spawn positions, customize-menu and pink-tutorial fixes. Refreshed
screenshot 2 to match the new visuals. (date unchanged — it is the
first-release date per schema, not the current build.)

Co-authored-by: villaintwin <dill.flynn@gmail.com>

Author: wolfmandigital