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Oh, this!
To those wondering, yeah, Android.
I have a VERY low-spec phone, couldn't run it without it crashing every ~2 levels, so I uninstalled. PROBABLY shouldn't be a problem for pretty much all of you. I can't even keep all my built-in apps updated without my phone's UI lagging, lol.
... I play another bullet hell called Danmaku Death, and even MY phone could run it. (^∀^)/. Until now, I never realized that there were many other bullet hell shooters as well. O.o