The depths of doors
It's very cool to see everyone's different interpretations and implementations of the theme "depths" -- fittingly, there's a lot of depth to it ;)
Focal depth, depth perception, uncovering the mysteries that lurk in the depths of the ocean, an underground cavern network, or my desktop file system. Invoking the mental state of "that's deep, bro". There's the depths of sleep, depression, or simply just digging a hole.
Don't get me wrong, I think "depths" is a fantastic theme. But some of us were moved by a controversial contender. Once the inspiration hit, we walked through that door and it closed behind us. Decision made. No turning back. And you know, I think that's one of the awesome facets about LD and the various theme ideas, that it inspires you to make something you wouldn't have thought to make otherwise. Cause, I'll be honest, when I first saw "doors" in the theme voting rounds, I didn't think much of it and was initially somewhat unpleasantly surprised that my dev buddy actually had a vision for it.
So in light of my initial disbelief of "doors" as a viable point of inspiration, and my contrasting joy in making a door-inspired game, here's my door-appreciation post with all the door-related games I've stumbled upon. If I've missed any (and I'm sure I have), please link 'em!

https://ldjam.com/events/ludum-dare/57/d-e-p-t-h-door-evaluation-protocols-testing-hub by @kabbi, @evoenn, and @sylf
https://ldjam.com/events/ludum-dare/57/doors by @oddballdave
https://ldjam.com/events/ludum-dare/57/lock-smith by @flying-butter-studio
https://ldjam.com/events/ludum-dare/57/were-at-the-bottom by @chifu
https://ldjam.com/events/ludum-dare/57/going-down-protocol by @erlioniel, @momotiktik, @smvynt, @whiteseason, and @ein
https://ldjam.com/events/ludum-dare/57/lockpicks-11 (<-- shameless self-promo)