Ja start with one level that contains all game mechanics and create prefabs, so you can implement all in other levels to increase difficulty over time. I did it the same way about 2 weeks ago in another game jam. If you want to you can check out if you want to, but it don´t fits the of brackeys theme.
https://iceman2708.itch.io/walters-nightmares
Dont give up, stay focused and don´t forget a break from time to time. :)