Good job on submitting a game on time!
Since you've still got time until the end of the jam, I recommend you add some artwork to this game, maybe make some cute drawings for the player character and sprites!
To do that, you can simply replace the sprite by dragging in the sprite you want into the player's sprite image on the properties panel.
Another thing which I think would be nice is soundFX and music, sound FX you should add with every click of the spacebar, so in your code where you're checking if the player is pressing the button, you can put a single line of code to play a sound effect, more info here: https://docs.unity3d.com/ScriptReference/AudioSource.html