Very solid work with "End of a World." The instrument choice, chord progression and overall feel of the song is lovely. It builds up nicely and has a strong finish.
"Hold Your Ground" has a great rhythm to it. The breakdown at 1:50 is great, and keeps the energy of a battle theme while still changing things up enough to keep the song moving. The revisiting of the melody from your first track is well done, and as much as that same melody gets repeated in this song, it's catchy and I never really got tired of it. The guitar chords and high strings that come in for the "chorus" sections at 1:22 and 3:12 do a nice job of supporting each other. I'm definitely going to have this stuck in my head all day.
Nice job overall!