Build your fort, hold the line.
Stack pieces into walls and block the incoming fire — don't let anything cross your inner line.
0 down | +0 salvage | 0
Tune for color vision, photosensitivity, and motion.
Drag a piece to move it.
Lift your finger to place it.
Tap a piece to rotate it.
Auto-rotate fits the piece for you.
(Toggle in Settings.)
With Auto-rotate off, tap Rotate to turn the piece while dragging.
Click + drag to move.
Release to place.
Prefer pieces that fit themselves? Turn Auto-rotate on in Settings. Placement hints (Settings) wash the cells your current shape can occupy.
WASD or arrow keys — Move
RX or right-click / the ↻ button — Rotate
Space Place / drop the piece
PEsc Pause (then Return to Title to exit)
No mouse? Tab moves between buttons, Enter confirms. On the board, arrow keys move a marker to aim flak — Enter confirms, Esc cancels.
Settings ▸ auto-rotate · placement hints · board shake · accessible colors · rotate side · audio
The well at the center is your core. It auto-fires at comets the radar detects — but it can't catch them all.
Inner walls are your kill lines — a projectile crossing one ends the run.
Comets fall toward your walls. The closer one gets, the bigger it grows and the longer its trail — and the nearest pulses. Accessible colors (Settings) swaps the threat ramp for a colorblind-safe one.
Breachers arrive as your walls harden — slower, heavier comets with a dark star core and a pulsing ring. One smashes through any wall, rivets or not. Shoot them down first: a downed breacher pays bounty salvage.
Multihit
Takes 3–4 hits
Reflector
Bounces projectiles
Bomb
3×3 area clear · sets off nearby bombs
Survive each barrage — it ends in a Fortify break. Downed threats pay salvage; spend it on the systems below. Armed charges wait in the dock — tap to deploy (one shared cooldown).
Build your fort, hold the line.
Accessibility
Published by CaliKo LLC
© 2026 CaliKo LLC · v1.0.0
Type: Big Shoulders Display · Geist Mono
Rotate your device to portrait to play.