This game suffers from some beginner gamedev issues (lack of polish), like the camera jitters when player moves, when you go sideways you go faster (you need to normalize the movement vector), your PNG files show a border, you might want to look into that. Also I recommend adding a fog to the level, will improve atmosphere quite a lot. Also animation for the enemy would add a lot to the game. Props to you for finishing a game and putting in the effort! I wish you all the best in the future, will surely check out your future games :)