Seriously fun maps, and I love the MEGA theme as much as I already did in vanilla (a lot, surprisingly!) The maps all have a solidly cute identity, I love the portable console naming scheme for the cups, and the maps themselves are a real fun drive in GP.
I only have two major issues with the current release, first being on MEGA Mellow Harbour- when coming up on the final corner, if you're hit across the starting area then attempt to cross the line, the lap does not count and you are forced to respawn.
Second issue is the Special Stage, which I'm 50/50 on. The titular maze is incredibly annoying to navigate, and you're going to be losing time on the first jump which seemingly requires either a sneaker boost or a full spindash to clear... and if you're doing the latter, the Claw will be far enough ahead for it to be incredibly hard to track in the maze which is very Jaws un-friendly. The jump out of the maze also requires two drops to ensure you don't fall off which requires at least one run to know that's coming. The instant the maze ends, the special stage gets to shine with it's theme & the walls actually function really nice compared to other wall gimmicks- and overall it's short & quick once you know what to do, which is a plus.
Overall, a must have map pack!