Hey jeevant - check inside the game. You can see static copies from the walkthrough option in the main menu, and pressing 'W' during the game will bring up an interactive version where available 😀
There's no current walkthrough for the last 2 levels, but for everything else, you can use this: https://mega.nz/file/aW4CjCrA#QHcUpJvQDmkhc9e4GpzlyEQKu7enBr9-Kq6wQGmcUMc
I periodically update it, and the link can be found on my patreon page 😀