Ufo Hunter (Rafagars)

A short kinda demo game for the gameboy. You control a plane and shoot down ufos. This is my first video game so any tip or advice for game boy development or game development in general is welcome. Includes 3 levels. I will include a new enemy for the third level and a boss. Controls Directional Pad - Move Btn A - Shoot Start - Pause Select - Change the speed of the ufos (Makes the game harder or easier)