The intense darkness, powerful dragons, and fast-burning light all lend themselves to an incredibly oppressive atmosphere. You really feel like any moment can be your last, desperately scrounging around for keys and lotus, hoping the dragons don't spot you. This feeling makes the final fight all the better, where you finally get to turn the tables on the dragons.
There are a few things I think would improve the game. Stunning the dragons should disable their hurtbox so you can walk past them directly. Dragons probably shouldn't be able to follow you to the next screen, so some bounds would be nice. I lost a run due to transitioning screens directly into a fireball, so something to prevent that would help.
Great job!