Very cozy beautiful game! Art and sound/music are professional level!
Just some things do add. My first impression is that I would float through the scene and not fall (I don't know exactly how balloons work, but I didn't expect the balloon ship to fall), and for me having to click up feels tiring after a while. Some enemies shoot too fast with no indicator that they are triggered (I had this problem with my game too), maybe if they also had a cannon, that start pointing to the player direction when in shoot range, it would be enough for the player to know they are in danger.
Apart from that congrats for the cool concept and for getting to finish it all in time alone!