My Metroidvania platformer Hyper Pixel Ten Thousand has been out for a couple months on my obscure personal website, and for a couple weeks on itch.io. I'm posting about it now because, after getting small-scale but very positive response for Hyper Pixel Ten Thousand here and elsewhere, I'm ready to take most of the main concepts of Hyper Pixel Ten Thousand into a larger project, and I've started a Kickstarter campaign for that purpose.
HP10K is already a complete game in itself and will probably take you many hours to solve for the first time, but it is small compared to commercial Metroidvanias. If you enjoy it and want there to be more, I'd like your support in making that happen. If you like it but can't back it yourself, please tell your friends.