You should remove the donate option from the itch.io page and make individual zip files for each build to make the download smaller.

A few things for the main menu. The text is hard to read on the background with the text color chosen. If you haven't already, take a look at Anchors for the UI pieces. It takes some getting used to when learning the scaling.

For the gameplay, the controls are smooth and the game plays well. I think some variable speeds could of added more difficulty to it. The earth graphic reminds me of that tank spinoff from agar.io. I did notice an asteroid stop after I shot the asteroid in front of it so not sure if they are colliding with one another or not.

As your first entry I think your team did pretty good.