Holy crap. I am so sorry that you found so many bugs that made the experience bad. That of course should not have happened.
I am looking into it right now. I really dont know if you are interested in the "lore" but I will give you the reward for defeating the boss, it happens when you speak to that purple sphere.
"It looks like a nebula. In its constellations, there are words written.
'After so long, I have come to realize that ambition is a double-edged sword.
I have gained power I had never before imagined. I have sacrificed everything I am for this goal.
I've done the right thing. But as I have gained power, I have begun to feel trapped in my own creation, a god imprisoned in his own realm.
I worry that my ambition will lead me to ruin'
The King"
After that, the candle in the main hub lights up and thats all. Demo over.
Thank you so much for give it another chance and for defeating the boss, It was a last minute inclusion so thats why its just a bigger slime. But I hope I can make it better for the next demo.
I will try to upload a version later today with some improvements and the fixes.