I also struggled a little with the rules on this one, as I just assumed it was normal solitaire but with the limited space and inability to move a stack it was really hard. Eventually I ran out of moves and tried some different things, and then realized I had could stack cards the other direction as well.
I think you did a nice job on the visuals (though it was a little sluggish but I'll blame that on it being a browser export), and it's certainly cool to see unexpected matchups like a parasite solitaire game. Good job!