It's a great concept for a game, I do love exploration games.
The 3rd level transition isn't very fair with the flying spike ball. Due to how the level transitions have a different type of camera type and are unable to react without losing momentum to jump over the spikes on the pillar.
Could use more sound FXs to help the game out, especially with the final boss; I couldn't tell the first time I hit him.
I had to reload because I've bricked myself on the stone blocks level, good thing you had a save feature.