I have few suggestion that I can think of right now having been playing a lot of games on my phone, as this may have been mentioned before by alot, but not too many.
I really think that it'd be good for all players, especially for those who don't have the most advanced phone, if you have more options, such as.
1. An option that lets you switch between auto-skill and skill-off.
2. An option that lets you turn off all the heroes special effects (skills) so that the probability of crashing (force-close) is minimized.
3. An on/off option for the ambiance and other effects. (Building constructions, wind or cloud effects, and some buildings having movements).
That's as far as I can think of right now, and I think these already cover pretty much a lot of ground.
