Good job submitting a project! It looks good and I definitely understand being a solo dev! I struggle with modeling and graphics and thankfully found a friend who is able to do it well. Keep connecting with people and make sure to find people who can do what you struggle with and you will be making awesome games in no time!
The mechanics were solid. I think the only thing that threw me off was the short distance of the bullets. I felt like I had to get pretty close before I could actually shoot the enemy. Good job!