It's not addicting. It is frustrating for many reasons. The aim is not obvious. There is no obvious logic and strategy in play. Don't know how to protect, don't know what to do in fact. Maybe adding a beginner level where we learn the working principle of the game and the basic strategy one can use.

The apparent logic of the game is too basic. Tower of defense is more interesting because the options are obvious and there are many way to try and explore.

However a more addicting game would involve randomness in patterns to deal with. Thus even if we manage to understand the strategy, it will have to adapt to the terrain pattern. This requires learning and repeated tries, which makes it addicting. Tetris is such kind of game. Very simple but introduces some randomness.