Very difficult to evaluate this game on my own. And I don't have a second player. Generally, you may want to stay away from multiplayer games when doing game jams, as they cause this problem quite a lot.
After a few hands I understood the mechanics, but I find the UI communication quite poor. It was difficult to understand who won and who lost. There are many ways you could have improved things. A few examples:
1. Particle Systems to indicate who won clearly.
2. Colours on the back of the cards being different between the two players.
3. Clear wording (don't say "Is Player 2 lying?" - "Truth", "Lie", because this may mean that you think the statement that the player is lying is true).
I didn't appreciate the graphics, like TRex nuts or whatever. Juvenile humour in my opinion. Which tends to be terrible, cause young people don't do humour.
I think the them hasn't been hit also, because it's not that your game is a liar. Your players are.