A Square Of Space And Time is a time-travel turn-based strategy game, about an area of spacetime three lightseconds across and ten seconds long.

You control the red spaceships. Left click to select, right click to move nearby or attack a yellow spaceship.

The End Turn button submits one second of time. The slider at the bottom of the screen scrolls through the time available - you can travel back and change your instructions.

You can also send surviving units back into the past to help alongside their former selves. Select a unit, click Time Jump, scroll into the past and click Confirm.

Rotate the camera with the middle mouse button, zoom with mouse wheel, pan with arrow keys.

And be aware that this game is still very very buggy. Spaceships may be visible but not clickable, lasers may be fired from timelines that don't happen any more, entire futures may glitch out and vanish entirely. With the 48 hour deadline looming, I've decided to chalk most of these up to time travel just being generally wibbly-wobbly and prone to causing problems with causality. Be forewarned. Sometimes scrolling the time scrollbar around helps neaten things out.

No explicit win condition as such. If you destroy all the yellow spaceships, you can consider yourself to have "won", but the game won't end - you can keep sending spaceships back into the past to cement your victory further, if you so wish.