You did an absolutely wonderful job! The art, music, and gameplay are all on-point. Has some serious old-school charm, which is much appreciated. The scarcity of health, paired with the upgrades, help make you feel powerful, but not invincible. My only criticism would be that some enemy patterns border on unfair, and the lack of health pickups can sometimes add artificial difficulty. But overall, you should be incredibly proud of what you've done!