Would you be able to show me a picture of the bug? Unfortunately, the HTML version doesn't seem to support the fonts correctly in some cases. That's why I also provided the executable version.
I agree with you. I was afraid of making the boss too strong and making the game too difficult, since the small planets can get in the way, and that ended up causing this.
I'll improve this in a future update ;)
Anyway, thank you so much for playing.