I have 2 small suggestions that I would like to be implemented:

1: I would prefer to have the ability to choose the enemy that I wish to attack.
(perhaps by tapping the enemy)
When I see a boss with low health, I want to attack him, but instead I am forced to attack a mere basic enemy that I am locked on to.

2: (It is of little importance) When I first enter any swamp map, I here the crickets and the background sound effects, however, when I tap my menu then return to the game, the background sound effects can no longer be heard. lol

That is all... rejoice! ^^