The main problem that i have encountered in producing the game was getting a collision to work between two sprites, the cat and the stars. I had previously planned for SpaceCat to collect stars as he jumped, therefore having to connect with the star in order to change the variable (score). However, as i have not been successful the Cat only jumps over the star and it appears as though the star vanishes becauses i have told it to hide. As a result the variable could be changed as the two sprites collide, which has taken away the scoring element from the game.