Don't post your barely started prototype online cuz you're just asking to get bad reviews.
Anyways I like the graphics, it's good for a Pico game so there's that. I really got nothing else to say about the game.
If you want my opinion on what this game should need, it could use a timed mechanic where you'd need to get to the next level before being caught by spikes or lava. I've seen some games use this, but there was no game centered around that game mechanic.
That wouldn't work if your game is trying to be Jump King like the description implies, but if the character "falls" by dying to an enemy or a trap then it's def a good idea to consider.