Scrongle does have a nice ring to it! I told the story behind how the name came to be on YouTube, but the short version is this:
In Unity, I have all sorts of places where dynamic text shows up. In order to make sure it looks good, I type something random out, and typically I use silly words or phrases just because it makes me giggle. The text where it displays the name of the hand you've played is set to "Scrongly". I showed an early prototype of the game to a friend of mine and he asked me if that was the name of the game. I said "Of course not, who would name a game Scrongly". Turns out I couldn't come up with anything better so it stuck, and here we are.
The tutorial does mention the game is over when you run out of cards, but I suppose that could be telegraphed better to the player. I will ponder on how to do that.
Glad you're enjoying it!