The game is very polished. The artists' work is gorgeous, they are great. The idea to make an arcade is cool, but the implementation of the theme is not very good. The initial level with the choice of planets does not have any semantic load. I think it would be possible to do something similar to the last stage of development in the game Spore while maintaining the arcade component. The variety of enemies pleases. In conclusion, I will say that you are really great.