Well done!
I have a couple of suggestions how to improve it further: the first time I wanted to go back and see the level I was searching for a restart button and could not find it. So I thought that if I go back to the main menu maybe I would have to start from the beginning?.. You can avoid evoking that anxiety by including a restart button.
They way they are currently, the controls are a bit of an awkward combination of keyboard and mouse - move with WASD then at the end of the level get the mouse to click on continue. It would be more engaging if some keyboard button was mapped to continue (like Enter for example).
It's an interesting concept. Maybe you could introduce some character ability to reveal (a part of) the map for a short time? That would incentivise the player to keep going.
Good luck!