Here’s my Ludum Dare game, I realised at the last minute I hadn’t actually named it, so I’ve just called it ‘Nebula’ for now.

http://urbanlogicgames.itch.io/nebula

The game places you in command of a lone starship hiding in a nebula with 5 enemy ships. You have to find them using probes, which can scan over a short range. If the probe picks up emissions from an enemy ship it will mark the direction the emissions came from (it should only take 3-4 of these to triangulate the ship’s position). If an enemy ship falls within the probes inner-radius it’s exact position will be marked on the grid. Once you think you know where a ship is lurking you can destroy it with torpedoes.

I didn’t get as far as I’d like with it. Enemy ships don’t have AI and are essentially sitting ducks. The scanner is probably a little too precise, I think some sort of analogue waveform readout with more ambiguity would work better, just didn’t get a chance to try it. Torpedoes can be customised by allocating power between speed and yield, though admittedly this doesn’t affect the game as much as I’d planned.