Aetherium tier — a whole new band of content past Rebirth 15.

Serpentine Refinery — a big S-shaped machine, the strongest ingot boost in the game (x40). Material snakes in at the foot and out at the far tip. Rebirth 18.

Aetherium Dropper — an 11-tile lopsided crystal mass, one cell bigger than the Singularity and far richer. Emits from the crown tip. Rebirth 18.

Aurum Press — a cross-shaped machine, and the first refinery that boosts a CRAFTED good instead of an ingot (x6). Rebirth 20.

Regalia Bench — a crown-shaped combiner, the widest piece in the game. Scepter + Gemstone becomes Regalia, the new apex good. Rebirth 20.

Prism Loom — a stair-shaped combiner joining your two late chains. Gemstone + Power Core becomes a Prism Core. Rebirth 20.

Processors tab — the Processor now lives in its own dropdown alongside three new variants.

Chain Processor — takes a feed on BOTH ends, so two belt lines can sell into one square. Rebirth 5, then 300 boxes. Max 3.

Golden Tipped Processor — gilded rollers pay x1.5 on every sale. Rebirth 8, then 200 Power Cores. Max 3.

Diamond Tipped Processor — x2 on every sale, the best there is. Rebirth 15. Max 3.

Cross — a 4-way crossing so two belt lines can pass through each other without merging. It has been in the game's files for a long time but was never buildable.

Clear Board button — sells every piece at once, with a confirmation showing exactly what you get back.

Drag to erase — hold and drag with the eraser to sell a whole run of belt in one stroke.

Rebirth is now an event: a screen thump, layered sound and a card showing the run you just banked.

Finished buildings flash green and pop as the engineer steps away.

Selling a building now takes it apart piece by piece and pays out with a green $.

The engineer powers up and down with a voice, breathes while it waits, and celebrates a level-up with a ring and a Lv badge.