Your character designs are very original and the main character is animated quite well, you only need to draw the whole set of graphics more coherently.

• The pig-egg's body is shaded and three-dimensional: so should be the pig's wheels and all of the chicken-bus.
• The trees are too small. If they are distant trees, in the background, place many more to give the impression of a forest: they currently look like climbable discrete scenery elements rather than decorations.
• The pig-egg is also too large for the platforms: the steps are about half his width, while the tumbling animation in the video doesn't fit in the pit width. Enlarging scenery to double size should be enough (for example, the character could walk on steps).

Well, since the main character seems to consist of both bacon and eggs, you could try to make a frying pan boss. ;)

Or a giant(?) set of teeth

can the egg-pig drill (spin) itself into the ground and let the opponent roll over it (except for the flame demon that will cook it)

features are to save flying fuel that recharges only slowly but digging takes time (needs to be started well ahead of the opponent arriving or crunnnnch....

piggy upgrade - the chainsaw

You can't simply flip the pig-egg's sprite when he turns: it's shaded with a light source on the front right, so it has to be shaded the same way regardless of direction.