As others have said, this is a very inventive use of the RPG Maker toolkit to create something that is completely different from the norm. I like the idea of subverting the RPG maker graphics by making sprites that constitute the graphical interface of a computer. This has a lot of potential and I like how you have outlets to explore the story further through the emails and other add-ons on the computer.
The central narrative of a photographer tasked to take pictures of a park that isn't exactly safe is a really neat idea. Games that play with the player's expectations are so much fun, and having the image 'corrupt' and the sinister villain take over the computer is a great idea. I hope you continue to explore this idea further as it lends itself very well to an extended thriller/horror narrative! Great work.
I think feedback wise, it would be good to shake the game up with some more dialogue or interaction with characters outside that of the computer, but that's obviously a matter of scope and ambition.
Thanks for submitting Error: Slasher Alert to the SCREAM LITE jam!