Aaaaaaaaaahh wrote a nice reply, got error message! Writing again!
I wanted to say now I have played the game. It has very nice graphics!
But for this type of game I would like it to be either very simple controls if you have to use keyboard, but the best is to make it capable for different kinds of input. For example gamepad would work best for this type of game movement.
But as fallback you might make the first level into tutorial level, make the tutorial a part of the game itself, in the graphics back, it is nice to do that way. So hopefully the player will practice to jump over some hole.. then gradually introducing more and more keys. Hoping for the player to remember them.
It depend much on where it is going to be. If it is going to be on website or similar it is important to be quite "quick" to get into the game or the player is gonna give up soon.
I hope you will get down the controls in a good way because you have so lovely graphics for this game.
Now that's my humble opinion.