Ok it didn't actually look good, but the web series for The 7th Guest... I'm just obsessed with all things T7G lol. Anyways here's the trailer, have a laugh

https://youtu.be/08_pRYc8r_0

It might not exactly fit the bill here, but ‘cancelled after one season’ is the closest example I can think of: Earth 2 (1994)

If I remember correctly (it was over 30 years ago), the last episode ended on a cliffhanger too!

This question had me looking up shows I remember hearing about, only to find they had a full season and then were cancelled. Probably because I didn't watch.

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Monsters of God, Set in Texas in 1867, during the Comanche Wars, the project follows two powerful ex-cavalry men, a war-hungry Colonel, and his seemingly by-the-book executive officer.

I think they've tried to adapt the Mistborn trilogy (by Brandon Sanderson) a couple times but it never got off the ground.

As controversial as it would've been, I was interested in that alt-history "Confederacy" that was being looked at by D&D

Or the Metropolis reimagining planned on Apple TV.

A show my partner finished production on that apparently the producers decided was "too sad" for their brand. It's the first time either of us has been on a show that finished production (at least shooting side) and never made it. Few times we've started on a show and 3 weeks into prep it gets cancelled before the camera showed up.

It still might get shopped around or whatever, I don't know how these things happen.

We got the wrong fucking murder-bot show.

Where's The Shrike, Bradley?

One Strange Rock

Odyssey 5 (2002)

... five space travelers ... witness the destruction of the Earth; they are given the opportunity to travel to the past to identify and prevent the cataclysm.

Rubicon (2010)

... an innocent character is caught up in, and slowly unravels, a major conspiracy.

Fantastic picture quality (for me, a hi-fi geek with a JVC projector). I forget to follow the plot while admiring the cinematography.