Hey Tiger, thank you so much for your feedback!
Sorry you lost your first run to that bug, it's probably a collider that is disabled when it shouldn't :/ (recipes don't have limited slots, the card should have definitely been usable...)
Highlighting all possible ingredients is a great idea, I will do that :)
And funny that you mention Card Survival: Tropical Island - it is definitely one of the games that inspired this one. Stacklands as well (obviously).
But I always wished that there would be more "build variety" in those games, making each run feel different because you never get the same options.
So I probably won't add the ability to craft anything you don't have the recipe for.
There is a recipe for rope too, but you can only craft it if you randomly get and pick that recipe ;)
Thanks for playing, I'm very happy you like the game! :)