Thank you for the feedback. We really appreciate it!
We will continuously try to minimize those frustrating draws and card situations by giving the player more options to tackle bad luck (like with the valkyrie powers). However luck and rng will always be part of this card game.
You are right about the first appearance of the reward cards. Thanks for pointing that out. We will address this in future updates.
We are currently using Godot 3.6 and are evaluating whether migrating to Godot 4 is worth the effort (for this particular game). But thanks for reporting, we will run some tests in FF to see if we can fix something on our end.