This goes so far above and beyond the engine's original limits. Implements completely new items, abilities from previous games, custom music, and world-shaping mechanics that would be fit in a modern PC game.
Very hard to judge the intended order - which is evidence of good design in a game like this.
Easily top-three of all hacks on this site, up there with Ascent and Hyper Metroid.
The only minor issue I saw was a few long backtracks, which is somewhat of a consequence of the larger world size.
Super Metroid Biohazard by Mentlegen, SMILEuser96 [ Speedrun/Race],
rated by Dynarec on Jan 01, 2022 ()
Great soundtrack. Unfortunately, I ran into a hard-lock due to a save-station bug. If you save at the lower station near Spore Spawn without picking up the High Jump Boots, then die, it respawns you in a different save station on the far left of the map near a watery area.
That results in a hard-lock because if you do not have high-jump, you cannot get out of the watery room that the save-station is connected to, while your save still points at that station.