I'm a huge supporter for PD games and apps.
This one however makes me want to encourage a reality check. The novelty of drawing on a small screen is arguably not a high-value experience. You still need access to a pc in order to make external use of the files, I presume. Even if one absolutely wants to have this possibility to draw on their PD, I would argue that the usability comfort is exceptionally sub-par. Probably an etch-a-sketch provides a more enjoyable UX.
Also, comparing the cost of the original software to this translation into Lua also doesn't sit well from an ethical pov.
Audience is smaller, the software environment is limited... This doesn't bring a comparable value to the original Mac software... It's also something difficult to quantify, so arguments can be made in every direction.
This being said, I applaud any PD development, because I love this tiny machine and Panic.
Obviously, this is just my opinion, a passionate PD user and not a developer, so take this as whatever it's worth.