Thanks for the feedback!
I agree, the card changing position like that leads to some bad UX given how fast cards are drawn and created. I will now submit a patch that makes their position static to alleviate that.
As for the shop, I had planned to add a refresh notification and show the timer near the button but didn't make it in time x) I'll add that very soon.
There will be an introductory level with instructions eventually. Though most likely I'll add 1 or 2 last core mechanics first.
You can pan the camera with WASD too, fwiw. I will add an option for right-click drag and make it the default soon. The edge pan is a carryover from being used to RTS games and I really didn't think that through lol.