Overall, I'm happy with my end product. I feel, for a first attempt at making a game, it was a fantastic learning experience. From the weird ways to make sound effects (bullet noise is just me clearing my through, with a bit of reverb added), to creating a dialog system and adding a bit of the ol' Scottish humour.
My one disappointment was that I never had anyone externally play test... BIG NO NO. Most of my feedback has been something that would have taken less than 5 mins to fix, but because I never had play testers, I never even thought it would be an issue.
Another learning point is that when you submit your game to itch, IT DOES NOT automatically submit your game for the jam lol! I uploaded my game around 15 hours before the jam ended, but only realised that I had to submit the game to the jam separately a few hours before entries closed... that would have been devastating!
Shameless plug - but if anyone wants to hear my super professional sound effects and view museum level artwork then feel free to have a play here: https://itch.io/jam/vimjam/rate/76722