For a first project in an unfamiliar engine this was definitely a good start! Responsive controls is definitely a thumbs up. What would have really given this that extra level of 'oomph' would have been some visual/audio feedback on your shots - the enemies visually shaking/flashing/some sort of animation when getting hit, the sound of your laser firing or the impact sound of your lasers hitting the enemy, as well as a similar visual/audio feedback when taking a hit too. But overall, great job on your first game in Godot!