The first and most notable room for improvement would have to be the graphics. While playing through a board, the HUD and tiles all seem blurry as if the images for these sprites were made with a lower resolution than you would normally expect. Consequently, it gets to be a bit hard to focus on the board itself.
That being said, I like the visuals used. The different gems are colored differently enough to keep you from thinking a color belongs to another group and accidentally try to form non-existent line, something that is a must for a Bejewled-clone like Molipop. The rest of the images, the backgrounds and borders also come through nicely, just blurry.
The second graphical note that needs to be mentioned is the font used for the numbers. The game uses a bubbly, rainbow-colored font. Unfortunately, this combined with the resolution issue makes it hard to see things like what level you are on, how many items you need to clear before going to the next level and other similar functions.
Audio is also a mixed bag. There are several different background tracks that loop pretty well. The music itself is fairly varied; you can go from a sound clip that belongs in a soap-opera to something with a bit more tempo. Unfortunately, because of the lengthy levels, if you find a tune you don't like, you might want to turn off the audio.