Hey, thanks for trying the demo.
The boss will continue to get improvements over time, for example: currently I think it's still a bit too random and it doesn't always give the player much time to hit it, so those will be improved upon at some point.
All music and most sound will be reworked later so expect these things to change, the current music is just something quick I threw together a long time ago so I understand.
So, I simply can't make everything as big as in Super Metroid so the rooms will be smaller in this game, that being said, there are bigger rooms in the full game than in the demo.
And if you mean areas like full zones and not just rooms, the same answer still applies.
I don't really consider the progression parts as secrets even though they are somewhat hidden, I think of it more like puzzles and this is one of the main mechanics of the game, so this is not really going to stop.
But I get what you mean, things can get a bit repetitive and I'm trying to come up with new things you have to do as the game progresses, not much of that is in the demo after a certain point though unfortunately.
The reason for the low ammo count is that I don't want the player to be able to spam the missiles but rather use them in specific scenarios like tougher enemies, bosses and such.
So this will probably not change, I'm not completely sure though.
Of course there's more than aesthetics to a Metroid game like the music and movement mechanics for example but I'm not making an actual Metroid game here so things will be different.
I'll just say what I always do:
I'm trying to make Super Metroid but not Super Metroid.
Anyway, thanks for the feedback, glad you like the demo overall. :)