Just beat it. It's really good. Everything promised, three screen modes, "Sharp" a cartoony 4x mode , "Smooth" the smoothing effect use don retro and nexus or "Nostalgia" no effects.
Quartz Quadrant and Metallic Madness bosses are a lil' awkward though considering they relied heavily on the shape the screen was and with a different size they're kinda cramped , e.g. Blue Lazers in the sides added to the last boss.
Also I'm in the top 10 worldwide for about 5 different acts, including No. 1 for Wacky Workbench 3 , w00p. Will probably change when more people get it xD