One of the first noticeable things is the easter eggs even on the menu screens, with the gift box catching the ball xD
Using 10 balls for all bells with each level, while trying to time it to land in the box as well for more balls allowed for so many strategic and time-sensitive moments. In the end I got stuck on level 3 over and over because I kept running out lol.
But I did find funny things such as pushing the ball into the box at corners sometimes made the ball roll out and back in, giving 2 free balls haha. Once I tried aiming far top-left and mistakenly pressed the back key, going to the menu. The "Levels" button just took me back to level 1 though lol...but I got to level 3 again in no time (and was stuck there again :P)
Fun game overall though! Nice use of bells, and really upbeat music that didn't seem to get annoying at all.