I love the whole presentation of the game and I'm looking forward to playing more of it!
A couple of things that would be great to see improved if you end up continue work on this:
- Don't let enemies spawn/walk on non-walkable tiles
- Reduce the player hitbox to the base of the sprite instead of the full height. Right now it feels strange for the character to look 3D, but take damage at the top of the sprite.
- Autotile the level as one complete unit after combining chunks so that it's more seamless.