Had a play of your game in this video here - at 55:10 -, where I give my thoughts while I play. Hopefully it's helpful feedback.
Was not expecting something like this to be made in a one week jam but I love it, being a humble little destroyer of worlds. During my play session the digging worked great! Only things I can think of was ammo capacity could have been a bit bigger possibly and the projectiles could have been a tad faster.
One possible bug I found was I did end up drifting out into space at the very end, not able to probably land on any planet before being once again bounced to the void. Still was a treat to play.
If you have time I'd greatly appreciate it if you could give my game a go to, happy jamming.