Great demo, this is my first time trying the game out and I'm pleasantly surprised by how good it feels to control the character.
Sure there are a bunch of differences from metroid and it takes a while to unlearn them but what I tried feels good.
My main gripe is that bombs take too long to explode and make using them to jump and kill enemies in tight spots frustrating, also the charge beam doesn't feel satisfying to use because it's so difficult to hit anything with it.
Other than that killing enemies with the normal beam and missiles feels good, enemies are a bit health spongy but missiles take care of them pretty quickly.
Very enjoyable, I'm looking forward to future progress!