Please read the credit's file. 
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Easyish is for general use, Harder than Normal is enjoyable for me (I usually play on Lunatic), Overdrive is just the next step in the formula (I didn't really test it =P).

If you haven't played the Len'En games, be wary of the flashbomb. As you graze bullets, the meter on the side of the screen will fill up. When it's full, use your bomb key while unfocused to activate your flashbomb. Flashbombing does NOT cause you to fail the spell. But be careful; hitting the bomb key while unfocused will do NOTHING if you don't have a full flashbomb meter.

I will be extremely grateful for any suggestions or criticisms, so if you don't like it please PM on MotK (I'm TresserT) me or email me (tres.adams@hotmail.com) on how I can improve. I know this file is copy pasted from the last three or so entries, but it's still super true!