Mostly the same as Icy Gifts 1 - same chain-reaction based gameplay, same mildly clashing aesthetics.
A major improvement over the first was the star system - getting all 135 stars felt a hell of a lot less frustrating this time around.
Another improvement was the performance - it felt a lot less laggy than IG1.
I do feel like the nuke and extra bomb powerups trivialised what challenge there is, though.