Hi guys,
have fun with the game! :) One hint about GDash: if it slows down remarkably when there are many explosions/falling boulders at the same time, then you can switch off the "particle effects" in the options. This should solve the problem!
(I mentioned it also in the forum, but maybe you didn't read it there, and I think it's an important thing to know because this little bug can be quite annoying if you don't know what to do about it!)

I just looked it up - actually it's not in the options but in the settings where the "particle effects" can be switched off :D