Interesting shoot mechanic. Well done! but it didn't seem like the purity or charge bars were important.
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Well, if your purity runs out, you lose the level. And the charge bar just tells you how much charge you have. I didn't make it very clear, but you want to complete the level as fast as possible with the most cards to get the best score. So if you want a good score, you should dash through enemies instead of shooting the cards at them :)