The art is great, just wish that the bosses were more balanced- the only boss I could beat was Death and then I got a black screen. Some of the UI elements could also use some explanation, like the top right move indicator or the two card counters, which I assume are remaining cards and discarded cards. The status effect durations are also unclear, since the UI shows the stack number, mousing over it shows the effect, and I just don't really know whether the stack number and duration are related or not. This was especially confusing with the Sun and Moon boss, since that boss is built around debuffs.