Great art and animation was cohesive and good and the boss was really cool and dynamic. The story elements were good but as as you could move at the same time kind of slowed things down and obstructed the view. Perhaps on a timer for the texts progression? or camera zoom or move to make it less obstructive to the player sprite.
I enjoyed exploring the large map and there were really nice tiles and trees bushes etc. A little more direction to the slimes you were hunting would have helped but I can see this would be a double edged sword as you want people to explore.
All in all I rated very highly as had an impressive depth :)