I found this game very interesting. I first played it when it was brand new, and I easily rose up the highscores. When I came back now, I saw that my score wasn't in the top 25 anymore. This shows that the game is very educational, yet it still manages to be fun. 5/5
I know that this is an old game, and the creator most likely will not look at this comment, but it would be nice to have the option of turning off the explosions. Sometimes, it is hard to see enemy bullets because they are being covered by the explosions.
I think I understand why the badge was changed. Some levels are impossible to do without certain "abilities". I'm not talking about the ones that require a microphone. Level 23 is an example of one that could be impossible.(I think)