It's amazing to think this is your first game, and you produced it in Unity, very well done!
I love the dark setting and being able to look around; it fits very well with a game of bluff.
You did really well to encompass the AI functionality whilst retaining the need for human logical thinking, which beat me, as you will likely see.
If possible, can you get the game to show what the last hand played was? I may have gotten muddled, as I thought I should have been able to play a different card on a couple of occasions, but I likely forgot the last card played due to distractions.
Also, when loading, have it start on the menu page so you can see the controls and instructions on how to play. When I pressed to start, it launched into the game, and I did not realise you needed to press right-click to play the hand.
Do not let my comments distract you from what an amazing job you have done!
Happy for you to share my comments or ask me questions.