Challenging
This game is very, very challenging. I grew up on NES classics, and even beat Silver Surfer, but this goes over that.
I will say the controls are okay, the music is good, and there is fluent character movements. No delay, either. Although sometimes it rejects me the use of jumping right after I land, besides that, the controls were fine.
This game is challenging, but there are points in the game where it is beyond challenging. Where you need to keep going and going and going until you get it. I like challenging games, but not action/adventure platformers that is on the verge of being a memory game, or a game with split second timing in all your movements.
For example, level 7 (or 8) there's this chest. I still don't know how to get it, but I figure you need to jump on the disappearing platform to the right, slide down the wall, and try a very tricky timing jump to make it to the other side of the wall. Getting to that chest is not challenging nor fun, it's tedious and frustrating.
Other than that, it's a pretty solid game. 8/10.