Thanks to @realdoggameplayer for having this saved. Holding S brings up the mask, as long as the vents work. Weridos (not helping you on who those are) disappear on the press of h Spacebar for a flashlight, to vanish certain enemys
Thank you @doggameplayer for archiving this game when I deleted all of the files for my games, alas, the rest of my ONAS games are lost to time Also, this game is bad, I might try remastering it