I use the exact same strategy and I actually think it’s the only way to beat the game at the moment. So I expected people to figure it out, the only question was how soon.
Of course, it’s not really a good solution. What I think I should do is nerf the lasers even more and add more factors to the game, like ship health, temporary bonuses or, like you suggested, new asteroids that can only be destroyed with some special attack. The point of this game is to be intense, make you feel on the edge. Which in turn brings huge excitement when you clear the asteroid field against all odds!
As for the visuals, yeah, I need to add particles and explosions when mining asteroids, animation for the lasers and for the ship, more asteroid types and more sounds. It’s all in my TODO list!
Thank you so much for playing my game and leaving your opinion! It means a lot for me! And I hope too that I will be able bring more quality games to you in the near future! :-)