Wow. There was a lot to this game! The unlocks were cool and the level design played really well with them. Adding shortcuts after boss fights so you dont have to back track is great and the game had a lot of gameboy feel.
It was a little tough to get started and the stop and go slow mo was really weird to get used to. There were some inconsistencies with the graphics, where I couldn't easily tell if something would damage me or not (specifically the thorns and the mushrooms look similar, but one damages and the other doesn't) but then you have a mushroom boss that damages you even though you just taught the player to ignore mushrooms. I also experienced a few bugs like others mentioned and a camera not moving issue after the mushroom fight (I killed myself and it fixed itself, so not a deal breaker thankfully)
This was my first metroidvania in the jam and it was a good time! Nice job!