Drastic performance increase on your capx..
delete all animations going left (they are the same as going right, just mirrored) and set your sprite to mirrored if facing left..
(Is 26 frames for walking really necessary?)
Crop all sprites in the image editor - the origin point will stay where it was..
The faded trees in the background will look just as good if the sprite size is much smaller and the sprite is scaled, if that's not what you want create a tiledbackground with one tree and stretch it..
Almost all events on the hero-controlpage are done every tick, by creating subevents with conditions the amount of code Construct2 has to read can be drastically reduced..
But your biggest problem are your sprites, too big, too many and all have collision activated..
Although I'm trying to optimize, it takes a lot of time..