It's not the cell phone for sure, because even the cheapest Android phones from best buy now have 16 to 32 GB memory and the game only uses about 136 megs for the main portions (200+ for the cinematic).
They have 16 to 36Gb of INTERNAL STORAGE not MEMORY.
Is it darksunpictures.com the website of your project?
Well, if yes, I'm assuming that you did a similar "best pratic" on your Construct project..
The website index has 66,200 KB.
It is far from something good, if you are doing things similar in your C2/C3 projects please first of all try to understand how everything works and what you should do as best pratics.