About half way through last week I beat Suguri (Find it on steam) I will admit... it's hard, so much so that I may of had to use an immortality code (see the Konami code) to get past third stage... anyway I ended up clearing the entire thing in half an hour (possibly because each stage gets shorter, the final stage is about thirty seconds then you're in the final boss fight) also an amazing sound track.
Not bad for a ten year old bullet hell.