Getting better...
Way better than the original. I especially like the adding of power-ups. Still, several of the things that could be improved upon in a later version are (and yes, I am going to write basically the same review as last time):
1. The menu. Although it is hardly important, and doesn't affect the game, it is the first thing people see. You might get a higher score if you give people a good first impression. For example, have a menu with a title, play button, options button, instructions button, etc. If you add more features, such as difficulty, power-ups, background selecter, music on/off/volume, etc., you can have more buttons on the menu, making the game look bigger and better.
2. The graphics. Although the graphics aren't all that imprortant for this type of game doesn't mean that you just have to draw a square and be done with it. When people vote, just having squared will reflect lack of effort. I'm not saying to exaggerate with the graphics and make them too complex, but make them a bit different. At least make the enemies triangles or something like that. However, the graphics were much better in this version that the previous one because of the sparkly things on the blue square.
3. The background. Well, it was a lot better than the previous version, but still not great. Maybe you can make it so that the user can choose between that background and a white background, while having the current background as a default.As long as the user can choose the background he/she wants to play on, your score will go up.
4. Vary the enemies a bit. The game so far is pretty monotonous, which may be a good thing, but the pace can be changed a bit. Make different enemies with different characteristics, or at least different appearances. Make an enemies speed the byproduct of its size (the bigger, the slower, the smaller, the faster), and make its size random.
5. The going off the edge of the screen thing. I know it's intentional, but it can get annoying. Maybe you could make it so that if you reach the top of the screen, you go to the bottom, if you reach the left, you go to the right, etc. Because getting your score into the negatives can get pretty annoying.
6. Make difficulty levels. Easy = 1, Medium = 2, Hard = 3. The harder the difficulty, the faster the enemies multiply/move. However, if the difficulty is set to hard, your score is multiplied by 3. If it is medium, it is multiplied by 2. And you can make more the 3 difficulty levels, with the same principle. For example, very hard could be 4, impossible could be 5, etc.
Anyway, it was a good game, and it has a lot of potential, and is getting better. 4/5.