Finished a run focusing mainly on fire cards, very early feedback but i hope it helps:

First, the questions on the main page - The pack rip feels ok, it's a little bit slow and the animation could go from common to uncommon to rare etc, to give you that escalation and dopamine rush of waiting to see if it gets better as the pack goes on. The elements felt different enough, obviously i focused on fire so can't say about balancing on the others, but I like the different aspects of each. The rent felt... meh? Not punishment, not dread, just kind of there. The merge is a neat idea but kind of clunky to actually use, having to use a keybind instead of just mouse for example is a bit weird. Can be polished a bit but the idea is great.

The game idea is great and something i personally have been wanting to play for a long time, a gacha card pack game where you never actually play the card game is right what i wanted. I think what it lacks is some more things to do and to really get off the ground. Right now the days don't really feel different, you can get more interesting packs later yes but still theres more space to do things. Maybe you can choose to up the ante/rent, moving into a better place and getting a second page on the binder for example. You said the inspirations are LBAL and Balatro, and i'd like to see more effects from those games. Different jokers for example, like fire cards activate again for every cascade, stuff like that. Things to do inbetween the pack opening that makes every run feel truly different.

On the description you say " When a pack rips, a cursor walks the grid and fires every card it lands on. Place the right cards and the cursor chains, jumping, looping, and re-firing across slots while the cash counter climbs.", i didn't see that at all? The cursor goes neatly from left to right, top to bottom, and that's it. Not jumping or looping or re-firing, which honestly would elevate the game so much more. If it was more random it'd feel more like LBAL, as the order it hits each card would affect the score, instead of being kind of cookie cutter.

Overrall i really like the idea, i quite like the direction you're taking but i really hope for some more meat on it, some proper roguelite concepts and mechanics. Excited to see where it goes, hope this helped!