Opening theme - Sounds kinda SNES, strong opener.
Copper town - Cool chord progression. The piano voicings will gell more and sound less blocky if you use different inversions, worth a try to see how it affects the sound. The sax melody seems a little too out, the chord changes are doing the heavy lifting for creating interest, so I think if the sax melody just hit chord tones and kept in the sound of the chords it would be really hip.
Petrification - Fun 5/4 idea, feel like a good time signature is subtle about the fact that it's not 4/4, and it feels natural here, although the rhythm of the melody clashes in an unsatisfying way at some points.
Mud Golem's theme - classic sing sing sing track! Would be cool to hear some harmonised horns on this one, there are some great resources on how to do this convincingly, just type big band arranging pdf or something of the sort.
Elder tempest - Very dark piano centered piece, reminds me of tigran hamasyan. Definitely check him out if you haven't already. Could see this breaking out into a heavy riff like one of his songs.
Dirt Festival - Strong rhythmic motif, uplifts everything else really nicely.
Credits - Cool 6/8 idea, feels like it's missing low end, like a strong bass guitar line.
Nice work doing so much in a week! Hope you had fun making it and find some use from my ideas/recommendations!