IMHO, you really need to compress your images, Dev. Version 0.3, and it's already 1.1gb on the Android version. It's unwieldy. There are many games with vastly more content that are half the size. I dread to think how big the game will by by version 1.0
On a screen as small as 6-7 inches, like most smartphones, the difference between 1440p and 2K is not very big. Nor is the difference between 720p and 1080p. A small loss in image quality won't be apparant on phone screens, but it'll make the file size much smaller.