Very promising concept you have for this game!!
Stylistically its very cool, I like how you chose the isometric view, and then implemented wall hiding so that you could see your character behind the walls, was very smart thinking, though occasionally this aspect can be a little buggy.
I appreciate how there are different types of enemies, with the skeletons being ranged fighters and zombies the melee focused combatants. However I think their AI and spawning could be improved. A lot of enemies spawn relatively quickly in the first room, and when your player dies it seems the game doesn't reset, the enemies are all in their same spots but it seems their AI kind of breaks since they stop targeting you once you respawn, unless you kill them. But then they respawn pretty fast. And I think the combat was clunky, I could attack enemies but it was hard tell if they were being damaged and Im not sure if you can see skeletons projectiles
I think the gates are a little buggy too, I tried picking up keys and interacting with them but they wouldn't open sometimes. I think the balance on level 1 and 2 could be improved
I think there is a pretty solid foundation and concept for a really fun game here, there just needs to be some work on improving aspects and ironing out bugs! The textures and player/enemy models and animations were some pretty nice touches!