The Force Field Card is a base upgrade and is played on a players turn. To use the ability, players will spend 3 energy to cancel an attack from someone who has declared that they are attacking. It can only prevent the damage from one attack. Remember, players cannot play cards on another players turn, so to use this card you must have energy left to spend at the end of your turn (your energy returns to max at the beginning of each of your turns).
The TNT card is meant to be passed around until a player rolls a 6, sort of like hot potato.
The Water Damage Sabotage Card is meant to be a random discard chosen by the player who plays it. The Severe Water Damage Card is meant for the player who plays it to look at their targets hand and choose a card from it to discard. We will clear up this wording in the final version.
I hope these answers help! And we’re glad that you have enjoyed the game :D