As a lone developer, my resources for making DragonMail accessible, and especially for playtesting accessibility features, are limited, but it is very much a consideration. Some aspects are intrinsic to the game design, such as not requiring reflex reactions or high-speed button mashing. Others have fallen out of my development practices, such as having full controls on both gamepad and keyboard, and there being no game-critical information conveyed only by sound, and especially no speech. Future accessibility features will be prioritised by Game Accessibility Guidelines recommendations where possible, except when a higher level feature can be implemented easily, or is specifically requested in this topic, or has benefits beyond accessibility.
For full details of the current status, download the Game Accessibility Guidelines checklist.