Ether One is a first person view adventure game that focuses on exploration and see the player exploring a branched environment as well as solving puzzles.
Pro Deeply layered
While there is little in the way of interaction, what is presented to the player is a deeply layered town with many areas to explore. It gives a sense of "realness" that makes for an experience much in the way art or music does, sometimes visceral sometimes eliciting past memories.
Con Side quests are relatively hidden from the player
For those that go into the game blind there is little in the way of explanation that there are side quests hidden in the game that relate to certain objs=ects as one explores. This means that many players will miss a large portion of the title.