I really enjoyed this game! I think the art is nice, and the gameplay loop is fun as well. Though, there are some issues with it which can kinda kill the enjoyment. One major thing is that the music doesn't loop. The music however is nice, and you have good sound effects to accompany it. Another thing is that the mined ores can be a bit difficult to spot due to their small size. Also, while you are firing your digging laser, you are able to switch to your attacking laser, but you can't switch from your attacking laser to your digging laser while it's firing. I think it's an oversight, but it hurts the game a bit.
The only thing outside of that is that you should make it clear on what the game is about inside of the game. Your current itch page has a lot of instructions, and it's hard to grasp everything. Having an in game tutorial that eases you through all the mechanics would make it much nicer for the player. Overall, this was a fun game and I can see a lot of ways to expand on it! Great job with your entry!