I've found an interesting thing, screenshots from beta. Since there is no beta pics of Super Metroid in sites like Metroid Database, I think, most people haven't saw them. So I post it here. Galaxar (site owner) said: "This came out of the subscriber-only version of issue 56 of Nintendo Power."

This one from early beta, possibly alpha. Rain is a different, HUD is a much different.

Next version. HUD is closer to release version, but that room is not exist in final version.
089 of Super Missiles? Glitch? Or, there was more than 99 of them in game? And what's the meaning to show "045 energy" will filled Energy Tanks? To duplicate Energy Tank's quantity? I.e., showing "Energy>510" when you have 5 Tanks and 10 energy left?

Room before Spore Spawn

Green bubble room. Grappling beam in action

Silver Torizo

Note about enemies

Big boss of Brinstar. Is Samus really 1.9m tall?
http://galaxar.sakabatou.net/page1.htm
Introduction to game

The whole article.
Source:
http://galaxar.sakabatou.net/Smetbeta.html

This one from early beta, possibly alpha. Rain is a different, HUD is a much different.

Next version. HUD is closer to release version, but that room is not exist in final version.
089 of Super Missiles? Glitch? Or, there was more than 99 of them in game? And what's the meaning to show "045 energy" will filled Energy Tanks? To duplicate Energy Tank's quantity? I.e., showing "Energy>510" when you have 5 Tanks and 10 energy left?

Room before Spore Spawn

Green bubble room. Grappling beam in action

Silver Torizo

Note about enemies

Big boss of Brinstar. Is Samus really 1.9m tall?
http://galaxar.sakabatou.net/page1.htm
Introduction to game

The whole article.
Source:
http://galaxar.sakabatou.net/Smetbeta.html
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