So some feedback came in off the reddit post. Notes as follows:

• Fixing felt dire. Think about that. Perhaps more Prophetic Prism style cards and 3 mana golden rocks.
• Card draw often felt a bit lacking. If you got the engine together, no worries but running out of gas was still a thing. Consider more mutual card draw.
• More graveyard recursion. Thinking some expensive artifacts for it as well as some coloured spells, ideally in several colours.

Going to have a think about ratios. Categories:

• Fixing
• Card draw
• Colourless artifacts
• Coloured spells
• Interaction pieces
• Recursion pieces
• "Engine" pieces eg. Aetherflux Reservoir
• Creatures... more means players less likely to attack with key pieces?

The first few goldfishes felt quite good, just unfinished, not polished yet.

Also agonizing over the size of the tower. I think I want it to be 100 card for a lot of reasons, fits in a boulder, only have to buy one box of shields, aesthetics brah... but 100 feels very small with SO many potential artifacts to use. Could possibly go to 150 but it's starting to get unwieldy at that point too, like, hard to shuffle.