Okay, so the good news is: I really liked that trailer. I found it witty and it made me want to play your game.
In my opinion, that’s part one of your sales pitch. Did you record any content around your game? Could you still create content around you finishing it? Sneak peaks, maybe?
All good suggestions above and you should definitely do everything they suggest. Seriously - every thing you can do that brings positivity, hell, even negativity to your cause will help.
GTA (when they were releasing either 1 or 2) planted stories in the media about the violence, prostitution and everything the game exposed your child to… Which they shouldn’t know about. What happened? The Pr stunt was a massive success.
Make sure you’re everywhere, all social media: Twitter, Facebook and Instagram are all great places to be for game developers. Learn each platform so you get the best out of them.
Make sure you create content - plenty of it. Don’t worry about perfecting anything.
I know you might not say you have a budget, but maybe think about getting some money together. You’ll be surprised at what you can do with £50-100 these days and I can guarantee you can cut things out of your expenses this month to make those savings, without really sacrificing anything. Clubbing for me, would be one. Another would be not to buy a new PS4 game this month.
Take a look at Paid Social ads, YouTube Pre-Roll ads, and maybe even think about building a simple landing page website, with a blog attached. A newsletter / mailing list will be vital too.
Try and get people (pre release) to sign up for your mailing list, follow you on social as you build up buzz for your game.
Most importantly, you want people downloading your game and getting to know YOUR brand.
Your brand is everything. Make sure you define it. Make sure people know what games they can expect you to release. Then you’ll build a community. This takes time, but it’s ever so important as many others have suggested.
I’m a marketer, it’s what I do for a living… If you want advice, I’m more than happy to answer any questions; either here or DM.
Either way, please add me to your mailing list. I want to play your game (and purchase it).
P.s. Please tell me your game will have multiplayer? I don’t expect it will, but it looks like it would be so much fun if it was.