You certainly captured the old school feel with the looks, but I found it rather basic. The sometimes pixel perfect movement requirements became frustrating at times. I'd find myself clip a spike and be thrown immediately back to a previous location. A half second delay to help process that I died might have helped. There were a few occasions that I immediately ran off an edge because I hadn't released the movement key fast enough. I might suggest making the character less floaty as it generally feels more responsive, but I think you used that to your advantage during level design. As a small note, I really appreciate that you made a sound for when the character runs. I find that small detail to make a big difference.