Firefox is my nemesis and it gets an Internet Explorer seal of quality for its 3d implementation. I guess the dragging problem might be the drop cursor not being very visible? There might be another factor, but that should be pixel perfect.
Packaging it into a reliable app is a good idea, I will do that in the future.
Reading adjacent pages is not intentional (I added it to the first page's rules yesterday), but I'm not specifically strict about that.
Combat needs to be scrapped altogether, maybe to a point where next demo will be puzzles and story focused. And yeah, the goal is to make the decks more meaningful for metroidvania progression. You can play just fine with autobattle button if you want to continue (it won't always win but it will get the job done).
Thanks for playing!