@piscesdreams: Possibly the same reason Shanoa has black hair in her portraits but brown hair in-game =p.
On-Topic: Very impressive so far, the engine looks butter-smooth from the video and the special effects are nice as well. I too am building my game in Clickteam Fusion so it's always good to see more Click Developers around here. One thing I'd recommend though is altering the physics of the skeleton "gibs" (or bones) a bit when you kill them. For example, when you kill a skeleton from the left side, the bone movement should still be random but be more likely to move to the right. Likewise, if it's killed from the right side the bones should move to the left. In addition, perhaps a subtle rotation effect could be added to the bones as they fly (rotation would depend on the direction the bones are moving). Rotating the gibs / bones is incredibly easy in Fusion 2.5 and probably wouldn't take more than a few lines of code if you wanted to slap it in for testing.
Awesome work though, I'll definitely keep an eye out for this project as development continues.