This game is fantastic. Mercurysteam did their thing. Just beat
Pacing has been so fukking good. Feel like I'm getting new shyt every 20-30 minutes. Never feels stagnant which a lot of other metroidvanias suffer from. The EMMI bits are tense as hell, and I think they switch the parry timing window so you never can Master it which would take the tension out when you're caught. Glad to get an actual new 2D metroid game in almost 20 years and it's living up to the hype.
EDIT: If you're ever stuck, open map and check doors. They specify what you need to open them and even say closed or open.
EDIT 2: Do not play this on docked mode. It looks straight trash on a TV. Handheld looks much better cause it doesn't show how low poly the assets are. This is a handheld game through and through.