@neon-kuroasa This is a very unfinished game. I didn’t have time to properly test these mechanics, but the idea was that you can’t avoid the probes forever — sooner or later they will find Earth.
They are invisible until triggered by a radio signal (the circle). After that, nearby planetary systems can detect them at a shorter range using their radar (shorter than the radio signal range). If a probe is close enough to a system, you can spot it before sending a radio signal and avoid activating it.
Once activated, they move randomly from system to system and are also attracted to radio signals. Redirecting signals back was supposed to be a way to deal with them, but it’s not working as intended.
All of this should have been explained in the game, but I ran out of time. I plan to release a post-compo version with the full idea implemented.
Thanks for reporting the bug — fixed!