Dotstorm eraser size is oblique

[SwartzCr]

The eraser has no color or border, and you can only tell how large it's going to be once you start erasing.
In addition, erasing and then switching background color has strange results.

[yourcelf]

Reference for how to fix the cursor part: https://developer.mozilla.org/en-US/docs/CSS/cursor/url?redirectlocale=en-US&redirectslug=CSS%2FUsing_URL_values_for_the_cursor_property