Blinking is not a bug but a visual misunderstanding. When you get into a dark room, you hear a spooky sound , and the flicker is caused by light sources on the screen (torch, campfire). It comes out differently depending on the environment. In Project Horizon, the muzzle fire and explosions flashes, it is more noticeable there. Even works in the case of rain + darkness, but there is no weather in the moon and crossbows has no muzzlefire, so without these combination... it can be just an understandable disturbing flicker.
For now, only one level, as described. The reason for this is that you don’t have to wait any longer for a larger game, it also provides some enjoyment on its own and as there is a lot of time and energy making it, it turns out whether it makes sense to continue / supplement or not.