It's hard to understand the effects of every proyectil, it's not clear. Also, the wait time between planets it's enormous, and makes it tedious. The physics are a bit weird. But overall, i had a good time ^^ Good job!
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It's in the instructions, fire projectiles are used on frozen planets and ice projectiles are used on volcanic planets. You can also hit planets even if they're far away but yeah I get your point, didn't have enough time to balance the speed of planets. For the physics I just used the gravitational attraction formula.