That's a pretty full maze and it checks the blocks for bomb use. I too only played a little so didn't experience anything but the witch that killed me. I tried yet again and she got me still! I guess I'll see if I can blow her up with a bomb.
Depending on how you implemented the maze, this might be something suitable for making a level editor or even dynamic computer generated mazes. consider those ideas if you build on it. good job overall. Also, there is a lot of FREE pixel art out there, some animated, so if you wanted you can easily improve the character without a lot of pixel art on your own. (( ouch, she got me again.... also, thanks for also implementing the arrow keys, I used those and the spacebar instead of WASD! ))
I also made an alchemist maze! My maze game is less of a maze and more of a puzzle though, try it to see what I mean. You can use my 'level editor' to make your own level, so if you wanted you can make a very large maze there as well. If you do, please feel free to share the level ID when you rate/comment on my itch submission.