Hull Rupture ships, modes and difficulty

Hull Rupture has 3 starting ships, 6 modes and 4 difficulty levels. You begin with one ship and Classic Mode, where the goal is to survive 20 alien waves; other ships and modes unlock through progression. Ships differ in layout, systems and loss thresholds.

Hull Rupture screenshot: a zoomed-out view of the whole expanded ship.
Official Steam screenshot: a zoomed-out view of the whole expanded ship.
ElementCountNotes from the developer
Ships3Start with one; layouts, systems and loss thresholds vary between hulls
Modes6Classic (20 waves) at the start; Endless is separate; Trade Mode is another
Difficulty levels4Guarded locations appear only at higher difficulty

The developer has not published the full list of all six mode names on the store page, so this page names only the modes mentioned in official posts.