Pretty cool, here are my thoughts:
The graphics were pretty cool, simplicity always helps for game jam projects, but doesn't easily translate to quality, which is what happened here. The lore isn't really all that present in the dialogue, some more worldbuilding would have been interesting. Around the second-to-last player, the dialogue started ending as soon as the text finished appearing in the box, making it impossible to read.
The gameplay was pretty fun, I liked that the enemies choices for stickers would affect your future rewards, and them choosing second added tension over victory. Multiplication stickers are of course the best, I didn't like the x2 against one type -3 against another because they were so situational. Not being able to pick the order stickers trigger was a bit tricky, it was a bit unsatisfying that they weren't used optimally. I also didn't know how to feel about the stickers covering up the card, it got hard to tell what the value and suit was. It was never really impossible per se, and I think that that effect is intentional, but I think the mechanic would benefit by making it either more or less prevalent, either ensuring the card is always readable or that more stickers will guarantee a card's base value becomes incomprehensible.
Overall, an excellent game jam entry. Seeing the other comments, I wish my Spanish was good enough that I could write this review in it, but that's unrelated. Looking forward to future work.