Nice one, the visuals and audio are really nice.
As mentioned in another comment I didn't really understand how the shop was meant to work. I could sell cards, but didn't seem to buy new ones? Maybe it's related to the bug you mentioned.
Nicely done, I really enjoyed the visuals and the fog of war. I enjoyed the way each action you take moves time by one step. Made exploring in a console looking game actually quite exciting.
I agree that it would've been nice to have controls indicated in game, but I found them on your page in the end.
It was a bit confusing to me on my first try how the buildings work :D Maybe being able to access the instructions from within the game could have been good, or maybe a tooltip to remind you what each building does.
I think even if you don't have any troops (from clicking the barracks) and then click on one of the walls, the little blue squares still spawn, which threw me off a bit. So on my first run I didn't really understand how you were meant to defend.
Clicking so much did get a bit tiring :D Would be cool to have some passive troop generation.