Perspective from a simple minded person.
This game is very colorful and there are many exploding things. There's a lot of visual stimulus going on at all times. It's very pleasurable, even when the gameplay is frustratingly hard. I'm not very good at these types of games, and I don't think they're very fun.
I want to compare it with the PSN games I've been playing lately. Stuff like Echochrome, PixelJunk Eden, fl0w. Those games are trying to be art, and I appreciate them for that. But really they kind of give me a headache and they're not that fun to play. As I mentioned before, Geometry Wars: Retro Evolved 2 is also not that fun to play, but the audiovisual experience is pleasurable. It's not an artful game, it's more like porn for your eyes and ears (as opposed to porn for your genitals).