Dodge the waves. Cut a path. Restore the rhythm.
WASD always moves
Same field. A different way through.
Science from the encounters you reached · select a topic
Read the front. Find the safe wake behind it.
Amber fronts are lethal. The dim wake behind a front is safe. Your cutter opens a temporary passage ahead of the ship. It does not protect the ship itself. After a hit, your ship flickers and shows a shield outline for 1.8 seconds. You cannot be hit again during that time.
Survive five 30-second encounters to reach the final battle. One health point is restored at each transition. Every round starts with a clear field. Choose Easy for power-ups every 10 seconds, Medium for every 30, or Hard for every 60. The first choice selects your cutter, the second refines it, and later choices stack extra speed, reach or width and restore one health point. Power-up choices pause the field and both timers.
Glowing cyan squares marked + restore one health point when you fly over them. Health is capped at three. Cells are not consumed at full health, so you can return after taking damage. They appear away from the craft, last 16 seconds and are shown on the surface map. Each new round clears old cells.
Violet hexagons are emitters. Approach a core and hold the cutter over it. Its segmented ring shows the remaining health. Each disabled emitter restores one health point. Disable all three final emitters to complete the run. Standing still cannot win.
WASD always moves the craft. Choose your shooting controls in the Shooting selector. With Arrow keys selected, hold an arrow to aim and fire, or two arrows for diagonal fire; release them to stop. With Mouse selected, aim towards the cursor and hold the left button to fire. Space fires in the current aiming direction. Arrow keys never move the craft. Hold Shift for precise movement. P or Escape pauses; R restarts. Touch devices have separate movement and aiming pads.
Practice any encounter with unlimited lives. Use the encounter selector to jump ahead. Practice never changes your personal best.
The ship, cutters, emitters and excitation all occupy the curved heart surface. Fly left or right to circle the heart; the camera follows. Aim towards the cursor, including when it is outside the heart silhouette. Waves and cutters cross the longitude seam. The upper and lower tips bound the playable region. The stylised heart is a game surface, not an anatomical reconstruction.
The fronts and wakes evolve through fixed Barkley reaction–diffusion equations. Sources, upgrades and objectives are game rules. The equations run in a periodic surface chart mapped onto the heart, with reflecting ends. Diffusion is in chart coordinates rather than a calibrated Laplace–Beltrami discretisation. This is a game inspired by cardiac excitation, not a physiological heart simulation.