Thanks for giving it a go!
I will consider making the mouse aiming crosshair behavior an option later on. There is room for improvement in the vertical auto-aiming but it will never be perfect. Luckily missing some shots is not that bad when the ammunition is infinite.
The control guide text at the beginning is just something I slapped in at the last moment when I realized there were no in-game instructions at all. It will be improved.
This is a very early version with a lot of things missing. Music is one of them. I intend to add music at least in the menu. I'm not sure about background music during gameplay. I generally prefer using a lot of ambient sounds instead..