My review

The game had a good concept. However, I think that there needs to be a lot of work added to the game.

The game needs more detail:

1. Create some variety with the enemies
2. Fix the high score screen by removing the background image
3. Add a space background image to the game to make it more realistic
4. Change the interface where it tells you to press the z button. The lime color was very hard on my eyes

Also, removing the loading screen because it's not needed. Gamemaker usually does not require a loading screen for room to room. Overall, the game is pretty simple and basic and needs a lot of work. However, do not let that discourage you! Creating a good game takes lots of practice. However, in the long run the practice is worth it!