For me, only two have really stuck out.
Happy Time Circus 2 - I loved the first one just because it gave me the heebejeebs. The first minute of Happy Time Circus is extremely atmospheric because of the lack of monsters. Unfortunately it was kinda ruined by the crazy Clown Dimension which introduced crazy disco lights, crazy gravity and a billion cheap balloon monsters. The second one is much better, and keeps the tension sky high. If you ever get paranoid about a demon sneaking up behind you on you in Doom, welcome to hell.
Insanity's Edge - This one reminded me why I'm playing ZDoom over other ports. Puts some good features to use while executing some good old fashion Doom gameplay. Also very good lookin'. If only the boss wasn't... y'know... Korax


