Interesting incorporation of the theme. I chuckled when i saw the description. You have a mouthy sister in real life don't you! :) Anyway game looks nice. The environment and level design looks good. I like the enemy models. If you made them yourself really hats off to you!
The dungeons are too bright and there's no spooky atmosphere for cosmic horror theme. You can also work more on on the introduction of the story. Why do we go into the mines? How exactly the cosmic horror fits into the story? It would add more immersion to the game.
Combat system is not bad but your sister can only heal i think, she cannot attack enemies. And there isnt't much feedback in combat.
I think there are some bugs. I suddenly got teleported to a room where there is no exit and quit the game there.
Cool game overall but needs some fixes and improvements on some areas.
