Really needs a manual save option. I got all jobs up to at least a Quintillion mana for the next level, let the game idle for five minutes and then quit. I come back, and all jobs are back to where they were when I first bought them!
A few suggestions that might help expand the game. As it stands, the game seems to be purely about buying the best you can
1) Weapon range/placement - there does not appear to be anything other than personal choice affecting weapon placement. If weapons had damage modifiers dependant on distance / obliqueness from the vault, it may help to add a layer of strategy to the game.
2) Weapon longevity - old tier weapons are redundant as soon as you open the next tier. This makes the player care little about their units. If old weapons could be upgraded to match new weapons at an equivalent cost (bearing in mind 1) above and 3) below) this would really add something to the game.
3) Vault Abilities -something like: you have to destroy all four walls to go to the next layer - the deeper you go, the more the vault protects itself, destroying nearby units so that the further they are away, the less damage they take.
Love the game aesthetics, just hoping for a bit more meat on it's bones.
Buttons. Buttons are an important part of a mouse-only, click-action game. Highlighting a large area of the game window and expecting someone to know where to click is not a good implementation of Buttons. "Click Boutique to start the game" is not so much an instruction as a sadists attempt at a virus.