Thanks for playing and a comment! Glad you've enjoyed it!
Yup, I wanted to add dragging the cards day one, but it went into a "nice to have" list and never went out of it - there was always something higher in priority.
> which I don't think I solved completely
That's what was very curious to see - how easy would people find it (as in our minds it was very straightforward). But yeah, you're on the final track, when you get a certain shiny card, that leads to the main ending(s).