This was really fun, I played it on your web build to get past the shader bug and I was able to clear all the clusters. I really enjoyed the look of the shader, it looked awesome! The map and mini map were really cool. I found a way to cheese the clusters by just blasting into them while I sat farther away haha
It's really cool that you added into the description what you were hoping for but couldn't due to the limitations. I agree with adding an ability to have the monsters fight back. Like having different enemies lock onto your location when you enter the cluster or if you hit it. In addition, I think adding a 'reload' or 'cool down' timing for your ship would add a limitation that the player would have to consider.
All and all fantastic job with the timeframe you had!