A complete playthrough took me 16 hours, plus spent an additional 2 ~ 3 hours with NG+ to unlock one of the endings and complete the bestiary (which are not possible to aquire in a single playthrough)
Great game overall and I think it's better than Chasm (and I liked Chasm a lot). My thoughts:
- Plenty of good-looking areas to explore
- Controls and animation are fluid.
- Lots of content. Bestiary, equipments, items, breakable walls and side quests.
- Story is interesting but the characters (or rather the writing) can get terrible at times.
- Way too easy. There is an unlockable hard mode, but it is designed for NG+. I imagine it would be too hard for your first playthrough, so I'm not sure if I should recommend it for that.
- The soundtrack is nice