Good atmosphere, and I like that you included a backstory. My only suggestion would be to include a requirements.txt, so people can install your deps easily. I had to inspect your code to find deps and I hadn't heard of pgzero, so first tried installing pgzrun and pip couldn't find it. After some searching, I found it was pgzero and could play, but this was a lot of work to get the game going.

If you're not familiar with requirements.txt, you create it by redirecting the output of pip freeze into a file: pip freeze > requirements.txt. That's on UNIX-likes. I'm not sure about Windows. This will make a list of all the packages you have installed and their versions. Then, when someone wants to set up the same deps on their system, they just go pip install -r requirements.txt. However, this really only works if you're using virtual environments.

It's a good jam submission. You've got music, multiple levels and such. It's a good basis.

I didnt die when I ran out of lives. It just respawned me with '-1 lives remaining'.

A 3x3 radius might be a bit short, but perhaps there could be torches in the dungeon that can be picked up to temporarily increase the radius or stationary braziers that can be lit. Perhaps even a rare scrying stone or something that gives a hint about where the key or the door is. Mostly just so there's more stuff to find along the way.

It's a general level design rule that players dont really like empty dead ends or empty halls. They dont all have to contain something but players like it when they have a reasonable chance of finding something. Could be a scroll or an inscription that explains lore or a useful item. 

Ofcourse you can still make a game about wandering mostly empty hallways, it's just not going to appeal to as many people, but it might appeal a lot to fans of that specific niche.

You should also try to restructure your code every now and then. Put things in seperate files, split bigger functions into smaller ones. That brings it's own challenges, need to import the files then and share or not share variables and all that but that's important to learn as a coder.

For example, the level1=[...] to level4=[...] is data and could be in a levels.py or a floorLayout.py. You also declare tot=False on line 37 and on line 51. 

It's a very good game but I found it too hard, you have to methodically explore all the corridors and it takes a lot of time. I think I would have liked it more if you could see in a 5x5 instead of just 3x3. The creation of the game is impecable. Well done bro!!

Nice