The Jellyfish do not appear in the game.
They appear to be alpha-test blocks with very basic stats and one small cannon.
The Jellyfish are not a playable faction, do not appear in the game, and have no ships.
Blocks
Their blocks are blue and orange and extremely simple.
Ships
There are no Jellyfish ships.
Notes
The Jellyfish blocks have a durability of 0.1, making them very weak.