Not sure what you've played already and how recent you want your recommendations, so...
- It's rather easy and linear, but I loved Guacamelee. Luchadors, alternative graphic style, warm colours, shit puns based on geek culture or mexican food, melee combat system with combos that doubles up as movement skills unlocking areas, chickens, the Devil... It even has 2 player coop. I loved every single minute of it. Have yet to play the second one so can't speak for it.
- Axiom Verge is a one-man love letter to Super Metroid. It's not perfect, but it's pretty good and your first blind run should have you puzzled for a bit as to where to go next in true metroidvania style. Shitloads of weapons, sadly most are useless or unneeded as you get the best one very early, but it's fun to hunt them down. Codes to find and use to change some layout, a unique 'glitch gun', some optional entire glitchy areas, it's very worth playing at least once. The speedrun is cool too, there's some great movement to be found, although the character sprite is too static and never feels as good as Samus running around.
- Environmental Station Alpha, another super metroid like, but in extreme pixel style. Don't let the graphics fool you though, it's quality and has everything you'd expect from a metroidvania and more. Includes some extreme platforming as optional content.
- Not as good as the previous hand crafted ones, A Robot Named Fight is still worth trying imho. It's kind of a procedurally generated Super Metroid. So each run will have a different layout, contain different weapons, powerups and bosses. It's all about adaptating to the seed and making the best from the hand you're being given. And of course, you can specify a seed if you want to, so if you enjoy a specific layout or have regrets after dying, you can always retry that one instead of going for a new one.