[0verAchiever]

Thank you!

The strikethrough means the feature has been implemented and I'm working on the next one.

[oneeyedpigeon]

A green tick or similar alongside each item (in addition to the strikethrough, I think) would probably convey positivity less ambiguously. (FWIW, I understood it to mean 'feature has been implemented', but that's clearly not everyone's experience!)

[pronoiac]

You could add "(done!)" after those, perhaps in a different color.