 If you liked
Satsuriku no Tenshi
|
 ...then you might like
Shadows House
|
If you like RPG Maker horror games, you'll most likely enjoy these shows. Satsuriku no Tenshi is straight out based off one. Shadows House isn't, but its ambiance is very close to one (think Mad Father, The Witch's House, Chloe's Requiem...)
Other than that, Satsuriku no Tenshi and Shadows House both tell the tale of clueless characters that are trapped in a dark and mysterious building.