Played to the end and I have some comments:
1) Great art style. The low poly look, the lighting, and that crazy sparkler spell thing were all highlights.
2)The combat, if a little unpolished, is headed in the right direction. I love me some methodical combat. Work on hitboxes and detection a bit more though, there were more than a couple times when I'd swing right through someone and the damage wouldn't register. Also, any kind of alternate attack (heavy attack button/running attack/etc) would go a long way towards keeping the combat from getting repetitive.
3) The grapple mechanics are good, but the first place you get to use them should be more forgiving. It was annoying to have to keep killing the two goblins every time I missed the swing while I was learning the timing of jumps and grapples. Filling in that area underneath with a blank floor with stairs to get out, or possibly just putting a checkpoint right before it would go a long way. As well, a different sort of indicator to let you know when you could grapple would help immensely. It needs to be more immediate (not a slow color change) because most of the time you're pressing the button in mid air and need fairly accurate timing. Also, it needs to be more noticeable. It was difficult to tell if the color changed in the lava pits (everything was red, so red wasn't really noticeable) and if you were slightly above the grapple sign then you couldn't tell at all. I'd recommend an effect like the fire on the edge of the torch (or sparkles like the spell, I loved the sparkles), but colored bright blue like the whip, just pop into existence near the grapple sign to let me know when to grapple.
4) That chest of gold in the lava was such a tease.
5)The goblin boss didn't spawn for some reason. I even replayed the level and got back to the cinematic, but still couldn't get him to spawn. I don't know if that is a bug or that part is just unfinished.
All in all that was a fun game. Good job.