I'm playing Rain World, and I'm actually really enjoying it, despite all of the perfectly valid criticisms leveled against the game by early reviews. In particular, the controls are really bad if you're playing with an analog controller. The controls are much less unreliable when playing with the keyboard or the PS4 d-pad, and this makes the brutality of the rest of the game significantly easier to stomach.
The key to enjoying the game is to think like a slugcat. It isn't, despite the vast, beautiful, enticing world, an exploration game. It's a survival game, and your focus needs to be on eating and finding shelter. Despite the fact that you will die frequently, the game does not want you to start thinking of the slugcat as a disposable avatar that you can just throw up against a wall until you bash your way through. If you're too brazen, too brash, you will, like most prey, get eaten. But if you're careful, cautious, paying close attention to the movements of your prey, the habits of your predators, getting familiar with your terrain in small excursions, you'll survive and progress.
That said, the system by which the game forces you to think and act like a slugcat can feel devastatingly punitive. The instant you get cocky and start wanting to push too far, the game will yank your leash, hard. It's not exactly the most elegant way to keep you in the right frame of mind, and it can be discouraging. The devs might be working on a better system for getting the same result, but I'm not certain. I know for sure they're going to be fixing the controls.
Anyways, it's a diamond in the rough, and it may just get polished to a fine sheen in the coming months. I'm having a pretty good time just being a slugcat.