Wow dude, that was incredibly quick! You DO have a lot of free time! Haha
There's a few places that I think could be improved with some altered tiles. For example, where the climbing walls meet the balconies, there's climbing wall on a tile that looks like it should be flat (floor). It messes with the perspective. As for the climbing walls themselves, they're great tiles, but I feel they're rather obvious. Hey climb up this! I was thinking they should be more like the climbable walls in Ocarina of Time, where they're just bricks which you don't see anywhere else. I'll attach a tile sheet which has some you can use if you want.
Another thing is around the clock. The clock makes a fine placeholder, but it should probably be bigger and more fancy, and it's not quite in Minish Cap style right yet. Then, the vertical things that are next to it, I know they're from the minish cap castle. I don't know if anyone else has looked at those and been like, "what are these? What is going on?" But I've never understood/liked them. I think we can do better. Personally, I think we should make some custom pillar things more akin to an actual architectural style, probably from gothic cathedrals.
Final critique for now is the windows, they're very small for the middle of a very tall wall. We can use taller, fancier windows, and we can add the recessed arches that are often on fancier architecture like this.
Anyway, I'm tacking on the tiles I have with the climbing bricks here, they're right below the blue roof by the arch. Also, if you want to use more of these tiles, it'd be cool because then our castle would stand out more from the Minish Cap castle since it's got custom tiles. Most of these are in the style of the King of Thieves town that was done long ago, and I think we can use some of these to make the castle and town match and go together. I don't really know how you work or how your tile sheet works, but maybe we can take the castle tiles you're using and try a one to one exchange on the sheet for tiles in this style, so it would just convert the castle you just did to look in this style? I don't know how that would work but we could try.
NOTE: the climbing bricks I'm talking about are on the left side, just below the Blue Roofed buildings from King Mob's Shadowgazer game.