tinyE: I'm a little vague on the term "roguelike".
I only just recently figured out ARPG and Metroidvania, so bare with me. :P
Roguelike, bearing in some term to Rogue, a turn based top down dungeon crawler known for complexity, with permanant death and one singular goal over many levels. The content is randomly generated and death awaits around any corner. [url=https://en.wikipedia.org/wiki/Rogue_(video_game]https://en.wikipedia.org/wiki/Rogue_(video_game[/url])
Diablo I is a roguelike, Nethack is a roguelike, FTL is a type of roguelike.