BioGun is available now on PC in Early Access. Watch the latest trailer for BioGun to see action-packed gameplay, various enemies, and the colorful setting of this twin-stick shooter Metroidvania, where you are in control of a vaccine fighting a desperate battle within the body of a dog. It's up to you to save our canine friends!

Dive into the best Metroidvania games on Steam, from hidden gems to top-rated classics, and embark on unforgettable adventures!
Good list, and kudos to having a list-article where everything is listed on 1 page.
Nine Sols looks nice, and also a bit similar in style to Bo, Path of the Teal Lotus, which should also be a good game (picked it up a few weeks ago but haven't played it myself yet ... )

Colorful science fiction Metroidvania game BioGun leaves early access, and you can snag it cheap in a Steam sale to celebrate the launch.
It's Hollow Knight with guns. Looks like a cool game, but I'm not sure about forgetting Hollow Knight.
Check out the new BioGun trailer for the twin-stick shooter metroidvania, out now on PC. Prepare to shrink down to microscopic size and control a vaccine fighting a desperate battle within a dog's body. Inspired by Saturday morning cartoons and developed by Dapper Dog Digital and published by Ravenage Games, BioGun sends you on a journey to save the entire canine species from an extinction caused by the sinister Dooper Virus. The fate of dog-kind is in your hands.