Hey!
I really liked your game, but there are obviously a few things that could be improved on (like every game here) if you were to make a full release.
First of all, the controls on the platformer side. You obviously didn't have time for this in the jam, but a lot of games have a "hold jump button to jump higher" approach when it comes to jumping. Also, to make the jump feel better, allow the player to jump even if they just left the ground, and if they press jump just before they hit the ground, the player should jump once they hit it. Maybe the "S" key should do something on the platformer side, too? A crouch, or faster falling? Or both?
Second of all, the dialog isn't noticeable. Maybe you should put it in a seperate cutscene, or just don't allow the player to move when in dialog. Maybe add storyline? And keep the levels very, very easy at first to keep noobs from being put off.
Finally, the death particles look sort of wrong. In pixel art, assign the "Sprites-Default" material to particles to make them pixels. And maybe you could put particles on the menu to make it more interesting?
I think this game is a really good idea with lots of potential. Good luck!