School and exercises got in the way. On top of that, the Tilemap system in Unity is trash, and I couldn't implement my gameplay-crucial algorithm using it, nor could I create my own, custom Tilemap as the Grid class I already have written despawns every time I exit play mode. This is why I could not progress.
In any case, I have certainly learnt a lot about the fundamentals of Unity, including custom Editor code and ScriptableObjects. So, it's fine I guess.
P.S.
Despite all the above, I haven't been able to create a substitute for the Tilemap for the entire week and it's still freaking me out.
Maybe I'll post a completed version a great deal of time after the jam has ended, as the idea I came up with was so great.