I like Liftoff but the one thing that stops me from using it more is the dark theme is still a bit too light. Trouble is, I don't like complete black Amoled mode either. Maybe I'm just hard to please 😁
To compliment the gestures already included, would be neat to be able swipe away images on the built-in image view. Your thumb is already somewhere central from clicking on the image and so would be more fluid to be able to quickly dismiss the image with a brief drag up or down in the image.