Thanks for the feedback, I appreciate it! To address your points:
- There is in fact an eraser tool available, as well as shape and fill tools. You can access them on mobile by tapping on the pencil icon, which opens a dropdown menu.
- Early on when I was developing Karektar, I did in fact avoid including an explicit eraser tool, instead using the approach you described. However it felt a bit finicky to use, and that including a separate eraser tool would give an additional degree of freedom. For instance, if you are intending to draw on mobile, but your touch accidentally interacts with a filled pixel, you can still continue to draw without worrying about erasing work you hadn't intended to undo.
- I had a feeling the footer text might pose an issue, apologies about that! The addition was an afterthought, specifically to allow people to access the original repo; but I'll aim to fix it soon.
By the way, towards the first two points: I did also include a modal to describe the key functional aspects, which can be accessed by clicking/tapping on the "Help" button. This was to ensure that people would be aware of elements such as how to access additional tools on mobile. However it seems like some of the interactive elements may still be unintuitive, so I'll see if I can make them clearer. Thanks again for your comment!