Very good!
The core gameplay is really fun, I got immersed when trying to beat the levels.
Here are the things that could be better:
1 - I would like more effects to be added, such as camera shake when hitting monsters, enemies leaving pools of blood, in other words gamefeel in general;
2 - At level 25 the scythe left the scene and I lost;
3 - The special powers could be more useful, since most of the time the scythe is just more efficient (obs: the fenix's song is kinda funny XD).