Keys are vertically about 1/4 to 1/3 too small which is bad for accessibility
The keys in portrait mode for osk-sdl are vertically about 1/4 to 1/3 smaller than squeekboard and the keyboard used during postmarketOS's install image. This seems to be needlessly, since there is enough space even while keeping the numbers row to make them taller. Differing in size to the other common keyboards likely used on the same phone will lead to disrupting people's muscle memory, so even independently of arguing whether that size is generally too small to type on, it's not good to diverge here. (There is a small chance that I am wrong since I didn't take photos for an exact comparison, but after rebooting and paying attention a few times I'm fairly sure my size difference observation isn't just my imagination.)
osk-sdl version affected: osk-sdl-0.66-r2
Tested on distribution: postmarketOS 22.06