Gravestack

A hero walks down a corridor and meets monsters. He fights them by himself — you never aim, never choose a target, never press a button to attack. What you do is stack blocks in the well beside him, and the well is where his strength comes from: clearing lines heals him and charges his runes, killing a monster brings rows down out of the well, and a critical hit throws a rock into it that no tetromino will ever fit.

The pressure is not gravity. Pieces fall at a fixed speed and there are no levels; what makes you hurry is the monster hitting you while you deliberate.

Score turns into coins between runs, and coins buy permanent upgrades: health, armour, damage, healing, and extra rows per kill.

Controls — keyboard or gamepad. Move ← → / A D · Soft drop ↓ / S · Hard drop Space · Rotate ↑ / W / X, back Z / Ctrl · Runes 1–4 / H J K L · Pause Esc

Playable in the browser above; Windows and Linux builds are below. Progress is saved on your own machine.