I enjoyed the strategy combat system of the game, the backstory sounds interesting and cool to build upon, the building SFX was awesome, and I'm interested in what you have planned for the future of the game.
I love the art style, the fact that there's a day and night cycle and even the music change the moment you step off the main area was cool. I enjoyed the writing and even the names of the Demomon while playing.
I uploaded a new version of the game onto the page, I fixed the weird file structure that I didn't realize I had at first, and hopefully fixed the error you ran into. I tested it to see if it worked in my end, and it did, so I hope it's all good now.