148 / Single-tile floor and walls It's often covered with the roomname, and if all the walls of a room are just a single-tile border is pretty disturbing (imo)
149 / Roomtext Well, I'm no more angry with that Space Station thing with Shiny, but I still hate roomtext. (Except for som1sezhi's 100 Challenges and his comments, nicely put on the top of the screen where you don't actually have to see.)
150 / VVV tunnel length Okay, now someone will surely kill me with a nuclear bomb, but I like veni-vidi-vici tunnels. When they're short. I mean, 3 rooms are enough (Notch's VVVV 4K), maybe 4. It's pretty annoying and difficult to pass across 10 damn rooms of spiky tunnels. Actually, I'll put a 150.b point, that's more general: Trinket challenges length. Including my inVerse Reckless Challenge.