Nice job getting this far!
In terms of levels that may give you trouble (+ some past experiences)
Slip Up (AL17) is full of low-friction (ice). Jumping is key to navigate.
Platform Race 2 (AL21) is similar to Platform Race (obviously). Your experiences with Platform Race should help you somewhat however.
Quaked Path (AL22) is just weird to deal with.
Ice Path (AL24) is difficult to do the long way, but there is a big shortcut that bypasses most of the level - which is honestly easier to do than do the level normally.
Random Mayhem (AL34) has lots of 'Random Force' which is difficult to deal with unless you know what the 'Random Force' actually does. It isn't random, but what the friction does is 'counteract' your marble's momentum. For example, having forward momentum will mean the 'Random Force' will push you back (and vice versa, so having backward momentum will push you forward). The same happens when moving left or right.
This isn't a comprehensive list (depends what you find hard/easy), but you can always post if you need help!
Steven wrote: -Handling low-friction surfaces
-Precision wall- and edge-hitting
-Negotiating tight spaces and narrow platforms quickly
When on low-friction, jumping is key. Jumping helps to move around more.
Wall/Edge hitting + tight spaces/narrow platforms is just experience and muscle memory. (although others might be able to give you better tips
)
"funny quote" - funny person 2016 part 2 electric boogaloo