Maybe an idea is to remove the colliders or the weight of the destroyed asteroids to make it more satisfactory to move around the space.
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Thanks for the tip! I did have a plan to make the destroyed asteroids move away on the z-axis in both directions (so that there was no way the ship could collide with them, and to add depth)) I had one attempt around 2 hours before deadline and something went wrong so I left it and moved on to finishing the rest :( I know it's no excuse, but I over-scoped a fair bit on this and the gameplay was sadly compromised. Thanks again for your feedback!