Pro tip: stock up on mana potions and potion power boosters, take a pile of them, four (or more) sledgehammers and a teleport sack to Vault 15. Cast Sneak for every enemy you can, then when you get near the treasure chests, use hammers to clear out the furniture. Cast Luck to boost your returns and teleport anything you can't hold back to your stores. No need to fight the immortal titans.
(...Actually, no need to fight much of anything at all. If you could get a 150% potion boost and enough mana potions, you could probably beat every five-skull dungeon in the game using nothing but the Sneak spell.
What's the Elixer of Twisted Fate (divine intervention) do, anyway?
Also: any suggestions for boosting my skills to where I can craft +maxhp/mp potions?
Suggestion: I don't really want to spend more than twenty minutes at a stretch fighting off consecutive bands of robbers. Maybe something could happen that prevents me from being attacked more than five or six times during any given trip? Really, this is getting tedious.
Gotta say, my biggest problem so far isn't with upgrade times, it's with large quantities of money randomly disappearing. This goes hand-in-hand with other weird game resets/glitches (like ammo counts changing after a level is finished) and I think it's caused by my internet going down momentarily during the game; regardless, it really shouldn't be happening
This game is good, but for me it doesn't quite capture the feel of a War of the Worlds tripod attack... I think the missing element is a city level with crowds of panicked, fleeing civilians. If there is one and I just haven't reached it yet, good job!
Reasonable potential, but could use a higher difficulty level and more variation in levels. I didn't have much fun with it, since I can already type really fast; after I figured out how to summon units, I couldn't lose. More in-game strategy, different scenarios, and a more advanced vocabulary would be nice. (Maybe the vocabulary could be its own upgrade, or come as a side effect of a max mana upgrade?)
If I could make a suggestion, it would be to add a minimap. Among other benefits, it'd add a lot to the recon missions to be filling out a map as you go, and I'd no longer get stuck with all the other goals accomplished and all the zombies dead, looking for the friggin' tower.
@Perttuv: if you're getting stuck, try looking at the waves as puzzles instead of TD waves. This is especially true for the challenge levels - I lost every time I played a heroic or iron level the way I normally play TD games, but won easily when I started looking at them as puzzles where my goal was not to build an invulnerable defense, but to find a solution to a given problem, using a limited selection of tools.
To that end, tower limitations act as hints in iron waves. You know all the enemies you're going to be facing for the entire level, and you know exactly what towers you need to beat them.
If you're stuck on challenge levels, try thinking of them as puzzles rather than harder TD maps: you are given a specific selection of towers and specific places to put them, and there is a solution that solves the level. This game is very well-thought-out, so rather than seeing the removal of certain towers as an arbitrary reduction on your power, view the towers you ARE given as a set of tools that you will need to accomplish a definite task. If it's there, you need it; if it isn't, you don't.
 "Arkandian Explorer"){kind=icon}
 "Bloons TD 5"){kind=icon}
 "Caravaneer"){kind=icon}
 "Boxhead: The Nightmare"){kind=icon}
 "Tripod Attack"){kind=icon}
 "Ink Battle"){kind=icon}
 "Decision"){kind=icon}
 "Kingdom Rush"){kind=icon}
 "300 miles to Pigsland"){kind=icon}
:D