That's a really cool concept. Was there a game that you took inspiration from? I've never seen this card stacking / investigation mechanic before. At times I didn't know what to do so I just randomly put cards together to see if something worked.
There are some games that stacking cards to things, like Staclands et al. I mixed point and click adventures and tried to solve with cards. I failed on couple of points, but I am working on them already.
