Thanks for the advice. I'll take this into consideration. My class is pushing us to try GameMaker, too. But I want to keep my options open.
Well, simply put, I was tired of hacking games and I wanted to make one of my own. The reason I chose a first-person adventure game is because I was heavily inspired by the MacAdventure series (Uninvited mostly). The mechanics and over UI needed some fine tuning from its inspiration, but I thought that it would be a nice game to have simple backgrounds and objects to solve the puzzles with.
Then, I got more people on board and the game evolved into something else entirely. I found myself doing a lot of drawing and coding just to create one household! The project kept getting bigger, but I didn't see it as daunting. I kept my optimism as I made one chunk of the game at a time, even while the work was steadily growing.
The reason I chose MLP was, well, it was my interest at the time and I kinda suck at making my own personalities. So, I decided to use the fandom's take on it and centered the world around the two main characters. Part of me regrets not using original characters of my own, but the audience I've attracted from these character is a definite plus.
Either way, I'm finishing this game. Period. I want to show other people and myself that I have the patience and skill to make something grand on my own and not give up on a project.