Windows always complains about .exes to me so I'm always used to overlook that.
I presume this is a demo because there are only dead ends as far as I was able to explore. Nice graphics on the character and the background, the tiles look rather weird though. The gameplay should also be refined - moving was kinda floaty, the knockback was too strong and the attack was too short and couldn't be performed midair so I always took a lot of damage from the enemies. Despite that I never died because the health didn't seem to work. At the beginning where you fall down I could also push myself against the wall which stopped me from falling.
Hope this helps you to improve the gameplay!