Great idea to allow multiple symbols per key, though it's not worth losing swipe over, so these should be behind a longer key press (hold for .5 sec then swipe to the corner ) or a double tap Is they any keyboard that combines those and is also customizable?

The numbers should also be in a numpad layout, unfortunately common mistake even in custom keyboards

Also some keys in good central positions like sdf are surprising empty, could reduce the overload of other keys by shifting some symbols there

Wonder how convenient corner gestures are vs pure horizontal/vertical