To start with, the 1-bit art style of the game is a personal preference. I really like it! The mix of genres kept the game interesting . The story was well thought of, it went well with the game. The last level was quite tricky after seeing the right path, so I can't argue that the level design was quite good.
The use of a bone as a weapon was good choice since the character was a skeleton. I realized after a while that spam clicking could destroy the bone.
But besides that little issue, GREAT GAME OVERALL!