Hi there o/ Glad to hear that you’re enjoying the app! (especially the UI :P)
This is definitely something that has been considered and will likely be implemented soon. We didn’t actually know about it until a few users told us about it on our Discord server.
Also quick note, you don’t need to tap the top, you can just swipe from the far left side at any point.
Give us a shout if you have any other suggestions or concerns surrounding the app. We may not reply to all of them, but we definitely read them.
There’s the Night Owl theme which uses very dark colours with a purple colour palette.