Well, it's playable; however, the graphics are rudimentary...as for the gameplay, didn't you know that the formation is supposed to move all the way across the screen? So, when the player destroys a column on the side, it takes them longer to go back and forth.

Space invaders clone with adjusted gameplay and weird graphics.

Congrats on submitting your game! I've been a fan of this genre since the beginning, and, unfortunately, your take on it is a step backwards from the gameplay in the 1980s, as there is no score keeping, no lives/extra men, and gameplay issues such as the sound effects in Wave #2 being much, much louder than those in Wave #1. It's also clear that English isn't your first language, so maybe have a native English speaker proofread your menu and story text.

If you can fix these issues, and continue to iterate on your design to make it better, I would rate this submission higher.