Well, this level pack has been around long enough now that I should probably comment on it. It took me a while to calmly think out my thoughts about this level pack, and I think I have a good way to approach this now.
While not terrible in any way, this level pack is completely lacking in originality, aesthetic design, and most importantly, fun. Because this is a first project, that's more than understandable. But with the number of updates and tweaks that have been done to it, it hasn't become notably better than the first time I tried it out in version Whatever.0. I think the time has come to move on from these levels and start fresh, and I'll explain why.
The pack starts out with the Eggman Castle stage, and it almost immediately makes a bad impression from a visual standpoint. That's not a castle, it's a brick. It isn't ominous, doesn't give us a view of the scope of the level (which is quite large), and looks undecorated and unfinished. The same could be said of every area in the map. Plain stone walls and stone tiled floors zoom past at a speed that strains the eyes to look at for too long. There's one room early on in the map that even seems to do this intentionally, using dark brick textures that blend platforms in with the walls of the room. Kind of clever, I'll admit. It's one of the highlights of the map, in a way.
Aside from the textures and blocky geometry, the first section of the level is far too reminiscent of Rainstorm Keep Zone from Mystic Realm. The entrance to the castle/keep is mostly the same, and the interior is almost exactly the same, but lacks the little bits of personality that Mystic put into that stage, such as the beds and cabinets. For christ's sake, you even have the exit to the outdoors segment in the same place, except in your level it leads to an long, non-eventful and linear path to an emblem instead of an almost tricky speed thok segment (for Sonic) that leads to a 1 up.
Moving on, the level's layout and pacing is not that good. There are an abundance of dead ends that lead to unspectacular rewards. Backtracking is necessary to make progress, and there isn't anything interesting about the Wolfenstein-esque hallways the first trip through. One time I almost got stuck in an un-winnable situation when badnicks flooded the hole in the wall that you need to use a spring to reach. Thank god for invincibility frames.
The ending of the level is also bizarre, dumping you into a room and abruptly cutting to the Act Complete screen. You didn't even bother to dump the player next to the goal sign, and it just looks awkward.
I don't have much to say about the boss. It's a bit harder than necessary with the pits, but if you take your time, it can be defeated easily enough. By far the best part of the level pack.
The next level, Ice Castle, is slightly better than Eggman Castle. This is really only because Ice Castle is more linear, which would normally a bad thing, but in this case means less backtracking and switch pushing is involved. But only less; those aspects hasn't been cut out entirely, unfortunately. Almost every criticism of Eggman Castle still stands for Ice Castle, right down to the stage not resembling a castle in the slightest. At least the concept of the stage is more original than a Rainstorm Keep ripoff, though.
Overall, this wad just isn't fun or very creative. It's not terrible or unpleasant to play like some wads I've tried out, but it plays so "safe" that there is almost nothing worth talking about.
My suggestion, as basic as it is, is to drop this level pack and start making some new stages. Eggman Castle is pretty much unsalvageable at this point without destroying the current layout entirely. The boss fight works well enough, but could use a better arena. Ice Castle has a passable start, and with the addition of a better underwater path, could be kept if the rest of the stage was tossed.
But for your own sake, don't try to polish this wad any more than you already have. It isn't worth the effort. Better to start fresh.
Note: I only played Eggman Castle, the boss act, and Ice Castle Act 1. If there are other levels in the pack, as certain posts in this thread seem to imply, I don't know how to unlock them and they are exempt from this review.