First of all, congrats on finishing your game!
I quite liked the visuals and the sound effects, it felt nice to control and shoot! and the impacts were satisfying!!
My suggestion will be in regards to the unavoidable "loss of control" that usually results in an instant game over, because of how bouncing off of walls reduces health and accelerates the ship. Perhaps if you temporarily disable wall collision damage and allow the player to bounce around uncontrollably while shooting the enemies, this could be turned into a really fun mechanic.
Other than that, great work!