Subgenre: ​Collectathon (11 treasures that you need to carry to the surface)
 

Movement Mechanics: Climbing from the get go

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Other: First game with corpse runs? (collected items are dropped after dying and can be collected where you died)

Item inventory (7 slots)
Persistent items and some are used more than once (jug which can be filled with water or oil - water is used to grow plants letting you use them as platforms or ladders to progress while oil used as a key on broken switches, boomeregg/teleport beacon - teleports you to where you picked it up, umbrella protects against falling rocks - used like a key, block for opening some doors by using it as a weight on switches)
Blow up floors with dynamite and a detonator - used for progression
​Some minor puzzles (plants, lift)
Locked elevator and extendable bridge
Some teleporters
Oxygen mechanic underwater and oxygen pills
Some instant death hazards
​Each treasure takes up an inventory slot leading to a bunch of backtracking to the surface

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Playthrough - Video Review/Retrospective

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Influenced by: Possibly Impossible Mission (or the other way around), HERO, Spelunker, Bomberman, Colossal Cave Adventure or Adventure

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Influenced: Possibly Citadel, Dizzy series, Exile (UK), Flashback (teleporter beacon), Metroid, Doctor Who and the Mines of Terror