Bedlam: The Game by Christopher Brookmyre Reviews
Bedlam serves as an homage to the first-person shooter genre. It's not quite as polished as the games it emulates, and its nature as an imperfect replica should be quite apparent to any FPS veteran. In spite of its shortcomings, Bedlam is highly entertaining and well worth your time.
The difficulty is never so punishing that you feel like you can't improve, and playthroughs can be short enough that you are never too far from just restarting a run fresh in order to succeed where previously you failed. The lore is shallow yet entertaining and battles infrequently unfair, but I keep finding myself wanting to play just one more run to see if I can perform better than last time on my way towards utopia.
The whole thing can be polished off in a long day (that's what I did), and in certain sections I was enjoying the old-school run-n-gunning. But just as often I was being frustrated by glitches, poor enemy AI (which is pretty unforgiveable after they mock it for being such in the early levels, and then never improves), or aching repetition.