Thank you for your feedback! I am glad you gave it a try.
The absence of a map is intentional. I understand that it is not something everyone will like, but I simply wanted to emulate the experience that some games I love offered. In them, the player has to actively remember the location of the levels, or even, in extreme cases (I remember doing that with "Eye of the beholder") write maps on paper!
Other than that, thanks for your suggestion! I can try to add such functionality in the future, in case I find enough time and I discover it's a good addition.