Thanks! I'll make sure to relay the art comment to Crase!
Since it was one of my first times actually coding in Unity the unresponsiveness was likely due to me not really taking enough time tuning the controls enough. Especially with having so much reliance on click gestures. I was surprised that the general scheme wasn't completely horrible though. So far the jumping seems to be the worst part; might rethink how the player jumps to tune the game a bit. Maybe swiping up or something a bit easier that doesn't require button clicks so the player is only focusing on direction movement and swiping up.
The falling out of the world will definitely be fixed, I would like to also make a smoother respawn with a quick transition that gets the player back into the game faster and with less abruptness for sure. I would love to get parallax backgrounds to work as well.
Thanks for the feedback and hopefully in the future some fixes will come to the game!