1) I like how you got the castle feeling by sticking to on-beat notes - that almost marching-like rhythm was something I found working well for castles as well.
2) The flute works well for the dreamy feeling. Also, those fade-ins and -outs plus the echoing effect on some instruments work wonders as well. Really nice :)
3) Let's goooo, this has a nice beat to it! I wish it was longer, or looped through it one more time.
4) The beginning is interesting as it is easy to lose the rhythm but easy to find it again too. The simplicity makes it good to listen to even though there is no sound on every first beat. I really like this one; it is very simple but just works. It feels like a more puzzle-y kind of dungeon. It still feels a bit dreamy (and a tad bit... sad?) though, really nice.
5) Wow, that immediately felt... heroic, final, absolute. This isn't just a boss battle, but a final boss, it must be! It feels like everything is on the line.
6) This does feel like some form of march or siege. Nice :)
7) Feels kinda emotional. Calm, serene, as if it all comes to light.
8) Haha, it - for some reason - gives me Mario Kart vibes. Idk, maybe some 'choose your kart' theme resembles it or something. Cool that you even made such a theme xD
I feel like your composition style is a bit similar to mine - we tend to focus on minimalist design, with few instruments. You nail your vibes though, you've always gotten a real good sense on how to create a certain feeling. Chiptune on its best. As always, a joy to listen to :D