It's a good start but could use a bit of work. Some suggestions:

• Your player ship doesn't shoot from the centre.. It shoots from the side, which feels really weird especially since your ship graphic doesn't have any guns there. You can move the location of where a bullet comes from using the shoot behaviour. From the shoot behaviours properties, tap the object to open the selector screen, then select your ship, and move the blue target to where you want the bullets to come from.
• Your enemies are no good. You're simply using the patrol behaviour, and them shooting on a timer. This can work in some games, but the way your game is set up makes it not very fun. Since you're giving the player total freedom in their movement, I expect them to shoot at me when I get close. For your existing mechanic to make sense, you need it to be a bit more like some classic shooters, where you can only move left and right, and up and down. One of the most popular (and extremely hard) classic arcade shooters is called RType. Search up some videos and you will see what I mean.
• The sound effects are pretty annoying.