Hi mamoniem,
Very cool, thanks for making these videos!
How are you finding Paper2D so far? There’s a trello board and a thread about future development work if you are interested. For making sprites quickly, you can right-click on a texture in the content browser and choose ‘Create sprite’, though you’d still have to then edit them to slice individual sprites out of the asset. In the future I’d like to have a nice quick tool for deconstructing atlases (e.g., just box select and type a name to make a new sprite).
For future videos/tutorials I might suggest using freely available artwork instead of ripped assets. Check out Kenney’s site which has a bunch of nice platformer tiles and sprites placed in the public domain (partially thanks to the open game art bundle done by http://open.commonly.cc/).
Cheers,
Michael Noland