Build me a video game or animation

Let me start by saying I have no idea how much something like this would cost. I don't want to insult anybody because I know your time and effort is worth a lot but I don't have an extensive budget. Basically, my girlfriend and I plan on getting married in a couple of years when I graduate and I wanted to do something special as a proposal. I was thinking of something like an animated video game that she could play through some of our life events and it would end with asking her if she wanted to continue her adventure with me and a "yes or no" option would appear. The idea I have in my head is in the animation style of something like Super Meat Boy or Scott Pilgrim. I imagine the game as an RPG but I really haven't worked out the details. I am one of the least creative people in the world so I have no idea how much something like this tends to cost or what goes into it so I understand this may be out of my budget so if you think this is something you could pull off, please let me know a standard rate or a flat rate so that I can ensure I have the funds. Thanks so much for your time!