I love the art, totally reminds me to many platformers of the 90's. (Jazz jackrabit, prehistorik 2, hocus pocus...)
That's the idea.
We want to make a nice platformer like those you said, and others of the 90's.
The physics look a bit weird isn't it? for example, when the character jumps, the jump speed is not instantaneous, he speeds up while going up.
It must be the acceleration in the "x" coordinate that makes it looks a bit weird. The "y" coordinate doesn't have acceleration.
Thanks for point this out!