Seems like my purple save files disappeared, and really old save file appeared instead.
To compare what I lost:
My purple save file had 249 green gems and 30 something blue gems (not include the blue gems used on the Lv3 Faster Spawn thing).
The regressed save file has 36 green gems and 169 blue gems.
This is sad (for me), someone please play some sad violin music.
@linthnhthnh you can explore about those things yourself. Just test everything as you play; you can always respec.
@animegirl18 I believe you need to buy with something called Credits -- not sure what it's called. You can buy that with real money or get something similar to Credits from really rare loot you can sell.
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Thanks for playing :)