Comments are your friend in that situation, forget all the stuff online about self-describing code and when and how to comment, that's fine and all but that matters is getting the words down! Write comments to yourself in the future! Before you start writing a function or even a line, write above it what you are planning to do! Put them at the top of the file too! Your codebase will always outgrow your memory... This is a major problem for me so I have a lot to say about it!
Aside from that, I think the fact you managed to get all this done, with all that to take care of at the same time is amazing! My first jam was also rough and I didn't really feel like doing another one since it was so stressful, but doing nothing just makes me feel guilty!