huan: I downloaded the demo back when it became available for preorder (still available). It lets you play the whole first island and judge for yourself, before you buy. So far it feels more polished than the demo, and I didn't find anything that could be called a bug. If you expect Witcher 3 graphics you'll be disappointed. Some light crafting to move the story along. Respawning resources, you won't have to spend hours to find crafting materials, most of the time you'll already have all you need. Rather easy fights - maybe boss fights will be harder, I think first island didn't have any. Some environment + crafting puzzles (there is at least one non-obvious secret on the first island), light platforming. Nice leisure game for several rainy afternoons.
I definitely wasn't expecting Witcher 3 graphics, but the screenshots and trailers misleadingly make it look like The Legend of Zelda: Wind Waker. Which it isn't. Not in terms of graphics, nor when it comes to gameplay. Tyrim is a mess, compared to Wind Waker. I felt everything to be extremely clunky. You need to be constantly crafting crates to jump on ledges, then picking up the crates again and losing a minute or two positioning yourself just the right way in front of the next ledge so that you can place the crate (if you're too close to the wall Tyrim won't put the crate down, and if you place the crate too far away he just won't make the jump). God forbid if you want to make more than three crates and stack them up to make steps of some sort. Yes, you can find crafting materials rather easily, but never near the places where you actually need said materials.
If whoever made this game didn't want people to think they were making a Wind Waker clone, they should have chosen a different presentation. As things stand, it's just misleading. The guys doing Oceanhorn knew they were making a Zelda clone for the mobile market and, afterwards, for PC. The Cornerstone studio made a game that looks way too similar to Wind Waker on screenshots and trailers, but that ends up not looking or playing anything like it when you actually start it up. Of course, not every studio can manage to strike that perfect polish level Nintendo is known to pour into their games, especially if you're an indie, but, come on!, Oceanhorn is a way better game and it's just as indie -- plus, it started out as a mobile game that eventually got ported to the PC.
I also don't think the crafting is "light" by any means. It's very much required for even the simplest of tasks. Want to jump and glide? Craft a parachute that'll disappear after three uses. Want to jump on that ledge? Craft a crate. Want to burn a spider web? Craft a torch. Want to attack? Craft a stone hammer. Want to defend? Craft a shield. Every. Single. Time. Entering the craft menu, selecting whatever you *need* to craft and then holding a button. This isn't "light" by any stretch of the imagination. It may not be ultra-complicated crafting, like what you find in "proper" crafting games (simulators, strategy, survival, etc), but it's definitely way too complicated and pace-breaking for an action-adventure title, which is supposed to be fluid and seamless. It serves the purpose of moving the story along? The story doesn't even seem to exist. You're a viking kid that doesn't want/like to leave the island, you'd rather craft things and stay in there forever... not exactly the most exciting thing ever, to really grab the players' attention.
Admittedly, I stopped playing after 50 minutes, when I had to lower a bridge to go save my sister, because I didn't want to have to craft three more crates and throw them to the empty weight basket that would make the bridge come down, and then have to boringly and clunkily fight skeletons and flowers with the weapon I needed to backtrack to pick up again, since I needed to craft a torch to burn a spider web and Tyrim drops whatever he's holding whenever he crafts a new item. If this sounds appealing to you, then, by all means, grab this game. If it doesn't, which is likely, just buy a cheap used GameCube and a copy of Wind Waker -- a game that won't disappoint and that you can actually enjoy during rainy afternoons. Or sunny ones.
I realize it was my fault not to look a bit more into the game after pre-ordering; if I had downloaded the demo, I probably would have known right away what a travesty this game is, and canceled my pre-ordered. I was stupid and only downloaded the game when it got released. Still, it's kind of ironic (and sad) that GOG, a store that prides itself in its curated/boutique approach, releases a game so unpolished as this one.
[EDIT] The game *is* available on Steam, so I edited my post accordingly. Thanks, Marioface5.