Strongly agree this feels fun and good to play with (like the amount of bounce and the speed the cards move at, as well as the way “picking up” a card by clicking and holding tilts it) and looks super helpful to be able to integrate into a game.

It’s mostly intuitive, but I got confused with how the cards come to the front when you hover over them and move when you click or drag them. At first I thought clicking a card not only made that card move to the right but also rearranged which cards were in the front and which were in the back in a confusing way (really, I see now, when I click a card without dragging it, the card moves to the right and I’m hovering over a different card that comes to the front because I’m hovering over it).

This feels so satisfying. Really great feeling card mechanic with the dragging/reorganizing. I think a "feature that would be nice to add" would be something like an area on the table where the card can be placed a bit messy. For example in your game Sacrifice, when you drag the card over to the play area, it will just drop right on the center in a nice neat stack. But if you have some margin for a bit left or a bit right of the stack, it would really add to the feeling of "I placed this card there". 

Plus, having a play area capability would generally help with the tool since you almost always need one in a card game like this. Less overhead for the developer looking for this kind of tool, yknow?

Work in progress...