Cool platformer game!! It has a lot of traps that are hard to spot and cost me many lives. (but I guess that's what traps are) The games has coins and signs that help direct and teach new players on the game mechanic. nice!
One thing I want to point out is that it can be hard sometimes to tell what is a solid wall and what is not. For example the cave wall on the second level and some dark stones that hang from the ceiling.
Platformers are hard to make in my opinion, so what you have here is super impressive :D