Metroid Planets: NEStroid fan game.

[Beastro]

This is a game designed to emulate the feel of NEStroid, while adding improvements to the graphics, sound, and mechanics. Each Planet is essentially a complete "game", but they are all bundled together and run on the same engine.

There are 2 complete Planets, one of which is the original NEStroid world. The other has an original design with some additional areas and bosses.

A 3rd Planet is available as a demo, and it is randomized, so each playthrough is different! You can even use a built in Room Studio to design your own rooms for it!
Here are some of the adjustments/additions made:
+Sharper Movement
+A Map System
+Restarting with Full Health and Ammo
+Customizable Controls
+Item Percentage, Time Counter, and Mini-map
+A Randomized Mode, where Item locations will be swapped randomly
+A Hard Difficulty, where enemies deal 2x Damage, and Missiles and Energy are reduced
+A Strike Mode, where there is a finite amount of Energy and Ammo in the world, but you start with all upgrades
+Automatic Saving, no passcode needed
+Keeps track of Speedrun Data for your playthroughs
+Smoother/Added Animations
+Fancy Particle Effects
+Equipment Menu, turn items on/off
+New remixed 8-bit audio

NOVUS - NEW WORLD MAP
This redesigned world has a larger world than the original, a completely new area, a few new enemies, and some new bosses.

CONNECT
A multiplayer feature that allows you to play co-op with up to 10 players! Also supports a Versus Mode for competitive racing!

ENIGMA - RANDOMIZED WORLD
A randomized world built from user designed rooms! Every world you generate is different!
To generate worlds, you'll need some rooms. Design your own or find Worlds and Rooms people have shared.

ROOM STUDIO
You can design rooms for Enigma directly in the game with a level editor

https://forum.metroidconstruction.com/index.php/topic,4952.0.html

The major thing to the game as you can DL people's room packs and generate your own randomized world's on your own through Enigma.

An example of a playthrough from MetroidMST's channel: