Hmm, aparently the game is intentionally as dark as a monkey's ar..
That makes it unplayable, and i really don't see the point in being unable to see anything. Sad, because the game looked interesting. Being blinded by the programmer does *not* constitute atmosphere in my view.
@SCUBBY: invincibility runs out when you regenerated about 45 mana (maxed manapool and maxed invincibility). Since it costs 80 that means you should cast each invincibility with 35 mana less than the previous one (i.e. 400, 365, 330, ..., 85). With a full manapool that'd be 10 casts (last with 85 mana).
Grindfest achievement is checked after the next level you play (just did 1 in normal), maybe there should be a check after leaving the upgrade menu. ...
I agree that shield is overpowered, most levels work by accumulating mana till max, then keeping invulnerability up constantly. Only the final challenge on epic doesn't give you the time for that, but even that i did by shielding whenever possible. ...
Levels 14 (bomb) and 13 (goblin) are good for idling for money: 14 plays itself once you're strong enough to kill the bomb with a simple assault, in 13 you can simply slay masses of goblins constantly sending in strong troops (maybe add a tower although it's lame). Let it play a while, finish level (shield ftw.), go crazy in the upgrade menu.
Since units loose all upgrades when leveling it makes next to no sense to upgrade units that aren't levelled to the last stage. RoF is imbalanced, instead of reducing the time interval by 10% for each point, the rate should be increased by a percentage (instead of t=T*(1-u/10) better use t=T/(1+u/10), though that'd still leave RoF the best upgrade by far).
Spell usage is severely manalimited in longer fights.
Really liked the game, but as it is it's too easy to give a fully upgraded archer a few RoF and support him with cannonfodder and too hard not to abuse RoF. When i limited myself to about 3-4 RoF upgrades it was still easy, but at least i didn't end each fight at about wave 10.
Wisdom is ridiculously underpowered. Note that for every point invested in wisdom all subsequent skills cost 50 exp more. So wisdom starts paying back at about the 50th skillpoint, and when you're at 100 skillpoints you break even.
Added graphic frills for the price of a clear interface, obscure "special" cards and a campaign that doesn't work (and aparently gives no bonus here). Usually, for a sequel i'd expect an something new or an upgrade, not a downgrade.
You can use the wings after defeating the endboss! After that you can reenter in a shop-level of your choosing, only it doesen't make sense to enter at level 99 since you don't get new wings (and there's nothing more to win in level 100 anyway).
Very nice game!
Some Ideas:
I found out about some editing capabilities (like flipping components) only from comments, only now i realised, that i was constantly ignoring the explanation line at the bottom of the screen.
A mouseover of the "select" function says, that you can also copy parts, but i have yet to find out how, atm i can only move. It would be nice if you could also rotate and mirror "selected" parts. A clipboard for storing often used aggregates might also be a nice thing, but maybe that would be overdoing it.
 "Tyrant"){kind=icon}
 "Reactance"){kind=icon}
 "Refraction"){kind=icon}
 "Sudoku Falls"){kind=icon}
 "The Infinite Ocean"){kind=icon}
 "Hidden Dimensions"){kind=icon}
 "Legend of Zelda"){kind=icon}
 "Epic War 4"){kind=icon}
 "Battle for Alandria"){kind=icon}
 "Diamonds Diamonds"){kind=icon}
 "Million Dollar Tower Defense"){kind=icon}
 "Protector IV"){kind=icon}
 "Castle Wars 2"){kind=icon}
 "The Enchanted Cave"){kind=icon}
 "Manufactoria"){kind=icon}