Amazing gameplay, good job!
It was brilliant to start with simple game mechanics to develop into a more intriguing mechanics as you unlock stuff. I also liked the charge shot, but the fixed 8 directions is slightly hard to aim atthe enemies (I was using a mouse & keyboard). I dunno if it's easier to play with a controller but yeah that's just my humble opinion in regards to playing with a mouse and keyboard.
Overall, I really liked the progression of game mechanics were you unlock stuff as you go on. I had fun playing your game, looking forward to future updates!