Ivy Draw is free but you will need to pay a small fee to unlock SVG export (and other features - each paid for individually). You can share the SVG file direct to One Drive or similar apps for transfer to your computer to continue editing with Affinity Design etc. Couldn't find how to set canvas size or dpi but this can be dealt with in a vector design program on your computer. Seems OK to use - can get some nice painterly effects easily. Has a little bit of a learning curve but not too bad. The 'export as SVG' exports to the device but easy enough to move the file to One Drive or similar for opening in Affinity Design or other vector design program (Illustrator if you still use it). Easy to use - can set canvas size but not dpi (easy to sort out when transferred to computer vector design program if needing to eventually save as png or jpeg). I quite like Infinite Design - free to download but you need to pay a small one off fee to upgrade to 'Get Everything' to be able to export as SVG. I have checked out quite a few now & top of my list are Infinite Design, Painter SVG & Ivy Draw. There is also Ivy Draw though it is more complicated to use. I will be using Infinite Design or PainterSVG. It looks good if you want to save as PNG but I couldn't see an SVG option. I looked for IblisPaint X - couldn't find it - only IbisPaint X - a bit more searching & found they are the same thing.

Adobe fresco beginner