Dark, slow intro. Works very well. Sounds kind of narrow like it isn't filling the space in the way I want it to. Sometimes people underdo reverb because they're afraid of overdoing it, when really there are some ways to mix it. One tip I got recently was reducing the EQ on the bass.
This would definitely work in a game. It definitely has a strong vibe. I feel like I'm in a 2D advernture game.
I like the addition of the Dies Irae chant in this! Heh. Funny thing about mine - for the last bit, I realized that I could sing Dies Irae to it, but I ultimately steered away from this approach because it made it sound more like an oratorio when I was going for something darker specifically for this.
I think overall the main critique is that the mix is a bit narrow and not filling the space, and then it sounds like it was clicked in. The piano is the best instrument a composer could ever know how to play, and knowing how to improvise on the piano will get you far. You're already good at composing, and I think improv would take you to a new level. That's pretty standard advice from me, but I still strongly, strongly recommend it!
Great work, and thank you for joining! :)