As someone who beat this level, I'll give an objective view. Difficulty-wise, Once Again is definitely an Extreme Demon, harder than Acu, TROLLMACHINE, and Cataclysm, but probably a low-end tier Extreme. It's consistent, but swingcopter part at the end is a literally nightmare. It's the hardest part by far and I died on it like, six times. Pre-drop is kinda boring, so gameplay overall gets a 5/10 from me. The decoration style is old-school 2.1, very reminiscent of Korean collabs like Visible Ray. There's even gameplay inspired by Visible Ray in Once Again. The decor is fine, nothing amazing, nothing terrible. It's just kind of there. Overall, Once Again is a relatively accessible Extreme Demon, if you can learn that swingcopter. The decorations is a nostalgic trip to early 2.1, which some might love or hate.