Lorn's Lure - This game absolutely enthralled me over the past 2 weeks. It's a parkour/exploration game, one developer, and it's just so well designed. Punches way over it's price for $15.
The maps are these enormous sprawling runes of an ancient machine, and there so much to find and see in each level. Then after beating the game you can go back with all upgrades and there are so many new paths, new secrets. There's this special feeling when a developer adds so much in just for their love of the game. Things that don't unlock new content, don't satisfy any goals, just more fun and interesting stuff to look at and play around in, if you want. Then you get to the last level and it's such an emotional peak. It's like the dev spent 7 chapters just teaching us, preparing the player for the final level, and then doesn't hold anything back.
AND it relates to both Hatch and Kill the K.O.T.H., Hatch specifically could be a lesson in pacing, I recommend that as well for anyone interested.
I feel like I'm ranting but I just want to talk about this game so much. The game is basically linear, but if you find a random hidden path you're rewarded with a tiny bit of environmental storytelling. If you work your way off the main path, you find entire sections of jump challenges that have no purpose to the game. It's like the game is saying "Look at this thing I built! Come jump around for a while!"