First, I'm glad you enjoyed the game! Secondly, thank you for the fantastic feedback.
- I'll check out the draw action on caffeine to be sure it's working properly
- Adding a confirmation for unplayed cards is a good idea, I'll look into adding that. The messages at the top have a prompt for "O to attack zombies and end your turn". That prompt is on a timer though. If you haven't ended your turn in say, 30 seconds, it will prompt you with how to end your turn. But adding another confirmation would help early turn ending.
- I have a slight "freeze" on button presses when it auto changes to the scavenge deck, for the purpose of accidental buys. However it may not be long enough of a freeze. I worry that not moving the cursor over may confuse a player that they no longer have control to look at cards in the scavenge pile.
I would like to add some animations of the cards going to your discard deck when you buy them and new cards being added to the scavenge deck, to help the player understand what just happened. I think more visual cues would change the flow of the game a bit and may even help some of the things you mentioned.
Again, thanks for the feedback!