Maybe I'll write more in depth, but the voting snuck up on me. I'll leave some short remarks.
I can visualize a campfire scene here. My ear wanted to hear some shaker perhaps, and some sort of percussive hit with a lot of reverb on the 4 of the first section. Going into the second section, I feel like there should have been some sort of pause or otherwise a way to go into the next section, otherwise there seems to lack some congruity. You did however have a Picardy Third which made my ear really happy.
Basisti94, Prelude to a Forlorn World
Your first section is really good, I have no real issues with it. Going into your second section, I would have added some more instrumentation. I feel like you were trying to evoke some form of hunt, or epic call, so I might have played with higher pitched drums, a french horn as a countermelody, and maybe even some tubular bells. I'm a sucker for tubular bells.
Shrinx, To The End
First notes being a minor 6th is a great way to generate space. 6ths are one of my favorite intervals. Probably because it's the first interval in the Kara no Kyoukai main theme. I have issues with your mix, you can see it visually on the soundcloud player. Your beginning is gentle, and when the rest of the instrumentation comes in,it gets really loud. I might have compressed it, or maybe mixed the piano higher. I think the piano in the beginning would have benefited from 16th note delays, and would have opened up the space in a really cool way.
BeckWreck, Malbona Tago
What a hack.
Danilo Ciaffi ,The Fall of Belial
Probably the strongert pieces here, so my criticisms may seem harsh or technical, but that's because I can't nitpick at the little things. I think wee need some higher species counterpoint in the beginning section. Actually, something I feel would make the piece stronger would be countermelodies throughout. You've got this fantastic sense of foreboding, but I have nothing that my ear latches on to. Different feel, but I would take a look at Soul of Cinder from the Dark Souls III OST. Like your piece, it has a constant underlying motif (though you have changed instrumentation part way though) and still gives a melody to latch on to.
Good playing, good tone. I would have started to explore more tones outside that pentatonic scale for a piece of this length. You've got a ton of prime repeats that latch to my ear, but it doesn't seem different enough. I would want to explore some percussion as an afterthought. Go find some random objects around the house and hit, drop, otherwise make it make noise. Doesn't always have to be strictly in time either. Take piece of paper and rip it slowly. Throw that in the back of a mix and you'll catch a lot of people's attention without them knowing why. Food for thought.
Birdnet, Prelude Woods
My only real criticism is that it doesn't feel like a prelude. More like a whimsical theme.
Tiger Child, Prelude, An Opening to an Adventure
Once again, I have no real criticisms here, other then I dislike your mix. There's no space. The word I would use to describe is "pressure" and too much of it. Very Chrono Trigger. The ending section reminded me a lot of of Corridors of Time.
Soundsandstuff, A Prelude to Tardiness
By submitting to midi, it allows me to open up a notation software and really take a look at your thought process. I like the Alberti Bass in the beginning and the use of chromaticism. I would have like to see you render this in an 8bit tracker.
I apologize as I'm at my time limit and am having a hard time listening tho things a couple times in a row. By virtue of being at the bottom of this list, you get the shortest review. The air of mystery is great. I want more reverb in that percussion, though that is becoming a common thread.
If anyone wants some exact criticism or wants to tell me I'm a jerk, please feel free to PM me.