Nice one! Ambiance is simple but effective! It controls well and it's not unfair either!
It was maybe just a tad bit repetitive. Only one type of enemy made it feel empty. Even the boss at the end is just a buffed up regular enemy. Maybe that's why I was able to first try it so easily.
Also, some sounds were coming only in my right ear (like shooting and enemy deaths), some in my left one (like the ambiance) and some in both (like the dialogue), which made it a little uncomfortable on the audio aspect of the game.
Apart from those two things, it's a nice entry for this jam!