The choice to not show players how much impact they have done throughout the game intentional! “Impact” is damage to the environment, and if the environment runs out of health, the game ends early, and the player who did the least amount of damage wins instead. The environment has a hidden amount of health, and it is randomized each round.
At the end of the game, you can view how much damage each player did by pressing the arrow on the right side of the game over screen :)