Hey watched it! I couldn't get the audio to work, so if there was commentary, I totally missed that...

So, couple of things - and I may say different things than those who wrote before me, hope you'll appreciate the diversity of opinions...

First of all, Goblin would not be my race choice for an Assassin when you're trying to beat Naga City. The concept of GobAss is totally sound for most maps - Naga City is one of the few that are not among them... The reason for this is that because Naga City is the second most abundant dungeon in terms of XP, you are practically guaranteed to reach L10 and have several prestige level-ups after that. I would most likely rather pick Human for this map. (When I was badge-hunting, I did a combo Purist + Faithless run on Naga City with a Human Assassin.) Furthermore, the topside of the map - as annoying as it may seem - is there to let you gather resources; the bottom side is where the real challenge lies. You are practically guaranteed to be L10 throughout most of your gauntlet time; and, you must learn to squeeze every bit of resource from the topside. A Goblin can give you maybe 2 extra level-up refills (no bonus to stats as of L10); this will not compare to what any other race can give you. Consider that you could get at least +60% damage bonus with the human; or extra 7-10 mana potions with a Gnome (280%-400% mana refill at your leisure, not tied to level-ups).
Now, on to preparations. I totally agree with the Compression Seal, the Black Market, and the Attack Boosters!

seriously:
1. Binlor would not be my top deity choice for the Assassin. I can imagine Jehora Jeheyu, Tikki Tooki, or honestly even Mystera working better. Depends on what you envision doing. Of course, Knockback is awesome to access the secret sub (and also downstairs), but you have the Bear Mace preparation which pretty much almost gives you what you prepared Binlor for. (Aside of the PISORF that is very useful against The Iron Man at least.)
2. Balanced Dagger is totally overrated. I mean it. Not just for this build, but in general. It's an awesome item to chance upon, and pick up in store; it's probably the worst possible prep ever. If you want XP bonus, take Yendor; or pick an item that lets you *earn* XP bonus by being able to go for higher-level kills (actually, this is recommended approach for longer levels like Naga City, where your Yendor XP will seem like nothing once you're starting to face the real fights). Now, for this build, it's also a bit off. Goblin can get a lot of XP, so she doesn't crave more bonus XP; she craves something tangible like an attack bonus or health bonus or mana bonus. Assassin does not ever want to fight same-level opponents, because outleveling them makes the kill cost zero resources. If you want to avoid having to go for L+2+ higher level kills, go with the Tikki Tooki assassin, who never has to kill anything higher-level...
3. Elite Items is awesome if you have a lot of gold, or a translocation seal; though it's probably my least commonly used bazaar preparation. I'd pick Apothecary (for extra Schadenfreude + potion(s) of your choice) or Quest Items (Dragon Soul; Soul Orb; Crystal Ball; etc.).
4. It is easy to underrate the basic Health and Mana potions. I think the potions you picked were good, don't get me wrong; I'm just commenting because very rarely do I actually remove the basic restorative potions from my potion kit, given their general utility. Maybe one of them for a build that is very much focused on exploiting one bar.
I felt that sometimes you engaged a monster (Tormented One downstairs being a prime example) without knowing in advance how the fight will turn out. DD is totally math! You should never have to wonder how the fight will go. Furthermore, you don't even need to do all mathsy calculations and stuff, you look at the enemy health bar, and you get a visual indication of what your current attack will do to it (and what the retaliation, if any, will do to you). Well, most of the time, bugs aside...

If you can cast 2 fireballs, and that's not enough to kill it, think thru how you'll activate more damage - mid-fight level-up; potions; shennanigans; boons; whatnot. You could've, for example, moved Tomithy diagonally up-left to form a triangle with the 3 bosses; then PISORF Aequitas into the Tormented one (and melee Tomithy in a way that applies the KB% damage onto Tormented One); level-up by killing a mob instead of killing a mini-boss; and unload a second volley into the bosses; this would've damaged Tormented One considerably, and made it easier to take down. Of course, some mana potions could've still been needed (or a yendor/conversion level-up). Or you could've just done what you did, and then drink a couple of mana potions to blast Tormented One via fireballs. Or maybe use the level-up for that, and just deal with the other two bosses afterwards, since you still had glyphs to convert (not to forget the Yendor in store).
Then the level-up to cure your mana burn... as mentioned before, a potion would've been much better idea. That way you get an extra full double-bar restore that is totally useful against the mini bosses. I kind of felt that even when you went up against the second wave, you were a bit unsure how to do things; poison TIM who has like 75% MR; etc.
So to recap... I think you need to have a good idea of what your strategy will be. And then align all your build elements - race, class, preparations - to support that strategy. If you throw a bunch of individually good-looking elements into the pot, you'll probably get something at least decent; though if you throw the right stuff, with everything supporting your basic idea, you'll get a bulldozer that makes you wonder whether you accidentally loaded Southern Swamp instead of a vicious dungeon.
Btw... nice profile pic!
