I can't see any in-game method for determining what a cut gem will actually do when applied to an equipment piece (before committing). Will this be getting added at some stage?
In response to recent comments regarding levels being impossible, and badge not awarding. I just completed all levels and the badge awarded just fine. No issues were encountered.
This game feels incomplete. Many features, common to shooters, are not present here, progression especially. I'm not necessarily advocating standard formats/clones, but without a clear understanding of what a game wants to offer, it's difficult to provide appropriate feedback, for future development. Right now, it feels like you start with everything you're going to get and sometimes a faster zombie will break rank, but aside from this, there is minimal variation.
I really wish kong comments could be edited. Each potion has a max cap of 15. If you have 15 health pots, you cannot purchase any hp or mana pots. If you have 15 mana pots, you can still purchase hp pots.
There is bug: you cannot buy mana potion if you have 15 life potion... jut drink a life potion and you will be able to buy a mana potion. I will solve it asap ;-)
Regarding issues with potion capacity. It seems that the intended capacity for each of hp and mana potions is 15, but whenever either hp or mana pot count reaches 15, neither potion can be purchased.
I completed the game, first playing through Classic levels (all of them), then just the New ones. Neither option provided the eas badge, for game completion.
Note: I waited a bit after being returned to the main menu, as some badges require that. This still didn't help.
As this is currently in rotation for the Badge of the Day, later this week, it would be nice to have it corrected.
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 "Craft and Conquest"){kind=icon}
 "Caeros"){kind=icon}
 "This is the Only Level 3"){kind=icon}
 "Versus Umbra"){kind=icon}
 "Fade"){kind=icon}
 "Zombie Road"){kind=icon}
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 "Words Warriors"){kind=icon}
 "Galxy Shooter"){kind=icon}
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Oh jeez you are totally right, I'll patch the gem girl to give you basic stats I'll edit this comment with the stats aswell