I am apparently the only person on this website to have played Subterra, as of this writing, and I imagine it will stay that way. This is a very short, old school, turn-based RPG that I received in a large $1 bundle, meaning it mathematically cost me about 8 cents.

The game is very simple, with your typical HP and MP healing items, revives, and the odd stat up item, with your four party characters including a main damage dealer, buff/debuff support, healer, and quick, ranged attacker. This is all fine, but I never used anything other than basic attacks outside of healing and one particular attack by the main character. The main character has an attack with a chance to paralyze, which worked all 5 total times I used it throughout the playthrough. Each time was on turn one of a boss battle, after which the boss was paralyzed and unable to attack long enough for me to defeat it, meaning I played the entire game without taking damage from any bosses.

The collision detection is wonky, but doesn't hurt the game, and each dungeon/area includes some imagination, solid music, and simple puzzles, and I have nothing negative to say considering this game was likely made by a team of one or two people. Overall, the game took about 2.5 hours to 100% complete on the first playthrough, despite it advertising itself as an "epic 10 hour RPG."

I would say it's worth spending a few hours on if you got it for very, very cheap and are super bored.