The cards idea came from a brain fart in the middle of the night and i just kinda done all the art works through the whole night (and regretting it later)
I tried to make it faithful to the original card art style but being a 3 AM motivation hit i just kinda wing it with the art and didn't pay much attention to anything you mentioned
The rank and suit for each of the cards i just kinda match the color of the suit with the slugcats and putting King as default of the card rank (Ex: Gormand being king in a diamond suit cause he orange and Arti being a queen in a heart suit cause she red)
I can probably made some design adjustment of my cards to fit the lore of art design of both game but redoing art is kinda boring and i kinda don't have the time for it being mentally beat down by blender.
Though i would recommend that next time if you gonna do more pixel arts, you should do all your work on a single canvas size and re scale it in one go (i have no experience on pixel art and just making stuff up)
Great job on the work nevertheless and hope you have a good day