Attached is a proof of my first attempt at Cyrillic in five years. It’s just basic capitals so far. This is a monospaced font, so there’s some weird stuff going on. It’s designed for retina displays at text sizes, so some of the weird stuff in there (like M and N) makes sense in context.
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Comments
In this case, yes, although I think it depends on the idiomatic style of the typeface, rather than a fixed rule. There are, of course, styles in which the left stroke is diagonal, or in which the whole shape is triangular, or trapezoid.
What these letter should generally not be is boxy, rectangular forms with just a sudden turn at the bottom. Whether starting truly vertical or slightly angled, the gentle, sagging curve should progress down the whole length of the stroke.
Й: krakta terminals should not taper as breve accent. terminals have heavier endings instead
Я: leg at steeper angle? Compare to Ж К
Д: white space above left and right teeth could afford to be more balanced
Щ: more white space above tooth (if doable)