Great atmosphere and visuals!
I wanted to play the game in windowed mode, but it didn't work.
The intro cutscene was amazing of course. But I noticed a few things about the text, also in the game. If you use blue text on a blue background, it's very hard to read. And in the game, it was yellow text on mostly yellow background. The font you've used is also very condensed, which is not great for readability. And then I couldn't read some text because it wasn't long enough on screen. As a general rule make sure to have text at least on screen for twice the amount it takes you to read it, better three.
The first level wasn't a great tutorial. Everything was very fast-paced, especially with the cutscene. And the controls are really not that great. I wasn't able to kill the last enemy. I think I needed my sword. There was just so much stuff on that level with only one checkpoint. So I always had to redo everything. That got so frustrating, I eventually quit the game. That's a bummer because it really looks cool and has atmosphere.
I'd really recommend doing some playtesting, even on a game jam game. It is tremendously helpful in getting the tutorial right and making the game accessible.
Nonetheless, the visuals and cutscene alone made taking a look worth it.