Stomp Rocket into the Milky Way game. We used a black tarp, hula hoops for the holes, and sticky foam stars with cardboard cutouts for decoration. Kids shot stomp rockets through the holes. It was the favorite game of our space themed party!
Nerf punch game. Simple to make and cheap. Folding poster board, solo cups, candy or prize, and tissue paper. The kids shot their nerf gun and busted through the tissue paper. Which ever cup they broke through, they got the prize inside. All cups had a couple of pieces of candy and a few had tickets for prizes.