Its pretty good. Finding I'm not playing it *that* much (only partway through world#3), because the saving mechanism means you can't play it level-by-level.
Its better than the DS one, and its a solid 9.5 - hard to find any flaws (gfx in some levels look weak compared to others).
Actually, yes you can! Just quick save and you can pick up right where you left off. You can even play other files without losing the quick save! It's just that the quick save isn't permanent and if you load it, you'll have to quick save again.