A fun little game, I guess.
The lack of music and the dark graphics makes it rather eerie. Seriously, put some shadowy enemies in there, one-hit deaths and maybe some fourth-wall breaking effects and it could easily be one of those side-scrolling horror games.
The controls are a problem. The fact that I have to use both keyboard and mouse makes no sense. I'd recommend to put Jump, Attack and Call on Z, X and C (Not necessarily in that order). J, K and L would also be good. Additionally, Jump with W and Up would also be good. Of course, the best option would be to allow the player to set their own controls, but for a game this small, I can understand that to be unnecessary.
By the way, I was sent here by StingDragon.