This really sounds like it's from the same game - in a good way. Cohesive but not repetitive. I liked it a lot :)
Winter Adventure - Great start, but melody becomes a bit too "quarter-notey" after first minute. Could use some more variety, especially as main theme is probably going to be heard many, many times.
Bard Theme - Very cool piece, but would sound more interesting with a second melody line. Perfect moment would be when you introduce the second instrument at ~0:53 - don't just switch, let them play together a bit, counterpoint or call and answer. You could introduce it a bit earlier then. Also flute part could probably use some more rests.
Wizard Theme - Very plinky, good choice for magic vibes. Sounds kinda eastern at times - was it intentional or just accidental pentationcs?
Fighter Theme - I suppose the lead was supposed to be distorted guitar? It's a tough choice. I've yet to hear electric guitar patch that would be realistic (even in top VST packs), so if you want it to sound good you need to play it yourself or get some loops. Otherwise it's gonna be a bumpy ride. Actually, if you ever need some guitar part again, you can let me know; I could record a line or two for you every now and then.
Meeting The Mountain King - I hear main theme coming back, nice. Would be great if you added a top line, either for some counter melody or maybe even chords. High strings paired with low cello/bass give very unsettling vibe; think horror movies: you have low pads and high shimmers, similar principle.
Till The End of Time - Only way I can describe this piece is "sweet". Felt right at home for wrapping things up, also sounds like a happier version of Main Theme first part - great job. I'd love to hear that one with some beefier VSTs.
Overall I really enjoyed this set. Can't wait for you to get some gear/sound packs, I'm sure you're going to make great stuff :)