Flying through a tunnel that reprisents dark matter absorption to bring your ship beyond light speed. Keep the line aiming down (towards the triangle at the bottom) to gain speed.

I only had very limited time for this entry but I still think it turned out interesting. See what the maximum level you can achieve is. It goes on forever.

Shout out to Szabolcs Dombi, Schwarzbaer and @simulan for helping me with some of the math and playtesting and pointing out some bugs!