As a beginner, here are some things to ponder (remember, any advice is just my opinion).
Your cover art is a bit misleading because the actual game looks nothing like what's presented.
Try using both WASD and arrow keys for movement. (Most keyboards have arrow keys on the right, and it is awkward for right-handed players if you also have to use a mouse.
Was it only one level? The end screen was a bit ambiguous.