Tiger looooovz space games! And yours is a great take on that genre. There are many good parts in it, like showing the scores upfront, having this nice picture of a solar system in motion etc. etc. Great job!
Some minor things: It is not running in Firefox (switched to Chrome, no biggy). The ESC key for starting the game is rather unusual, and conflicts with the full screen mode (ESC also ends fullscreen). Enter or Space might be the better choice.
Other than that - really enjoyed it.
( As a true space fan, I also developed a space game in the past, maybe you want to check? https://humane-tiger.itch.io/astros )