I keep feeling this could be something better
Good: Well, you didn't use stick figures, so that's a small blessing. I like the worlds and gravity element.
Not so good: Slow, clunky controls, really bad writing, just not very fun. Early on, you tell the player to jump on top of enemies (I assume that's what you're getting at with "overhand") but the first enemies there are the baby godzillas which do damage to you if you jump on them.
Your next one will be better.