Also, crop the empty space in images. For example, your Sprite11 resolution is 7200x4800, and about 90% of it is empty space. This sprite alone takes about 150MB of memory when loaded! This is absolutely unacceptable for web games. Your entire game should use that much!
Click the Crop icon on the toolbar to remove all the empty space, and then resize the image to something like 600x800, preserving the aspect ratio.