Undertale is well worth playing if you're looking for indie stuff, and I'm of the mindset that its gameplay is just as good as its story elements.
This.
I felt the same way about To the Moon. Touching story, but I don't know if I got anything more out of it by playing it than I would have by watching it.
Like, that horse riding section, yo.
Ugh, and the zombies. If the puzzles were actually varied, then this game could've been a fun little puzzle game, but every memento's solution was some variation of "press the corner button first and see what happens."
I'll probably play Undertale next. Papers, Please looks pretty neat too. Who knows when I'll play Drakengard 3 and Chrono Cross.