Good stuff! This is a solid start on a cool little shooter game. If you continue working on it, it might be nice to have some more feedback systems in place. For example, when the player bullets hit the asteroids (a particle effect maybe?). As others have said, I also think the game could have a faster pace. As it stands, you're kinda stuck waiting for the gold to fall once it spawns and you miss out shooting the other asteroids. Overall though, nicely done. :)
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I am looking at how can expand the game and the idea of feedback had not occurred to me. I will have a look at a couple of ways to give the player some idea of how much damage they are doing to the asteroids, maybe some way of changing the colour of the asteroids as their hitpoints drop and I like the idea of particle effect explosions for each bullet hit. Thanks for the feedback, it really helps.