Hi. First off, thanks for playing. This is a fair criticism, and something that I thought about near the start of the jam. I didn't have any intention of trying to pass off any of the assets as my own creation - in fact you'll see that I have pointed this out on many comments praising them. The credits are not in the game mainly because I ran out of time to properly put them in. I understand that to a lot of people jams are about making everything in the time frame. For me I had the concept and an idea of what the features were that I wanted. In order to make those happen I chose to use 3rd party assets as I am no artist and it certainly would have taken a significant amount of time for me to get the art to what I personally would consider acceptable quality. Perhaps this was an error or misunderstanding on my part, and I'd be interested in getting better at pixel art myself or teaming up with an artist in the future.
By all means rank my graphics and audio score 1/5 (I would have withdrawn from those categories if possible).
As for what exactly is my own doing in the game... Pretty much everything you don't see or hear! All of the code is by myself, save for a couple solutions pulled from the internet. All the scenes, animations (the ones in the animationplayer not the sprites themselves), and game logic were set up by me. There are a few assets that are my own creation, but nothing crazy (the health bar, skill icons [if you count those since they use the sprites], and arrow sprite).
Again thank you very much trying the game, and even more so for your detailed response that you clearly put thought into!