Thanks for the feedback! I will be releasing an update that makes you able to hold the mousebutton down to shoot as soon as possible!
I am aware of the noted bug you wrote down and im not sure yet if i want to keep it in the game or fix it as it actually balances the game a bit. I totally agree with your feedback on the bosses, definetly the first boss needs some more veriaty attacks and the shielded one is a bit too overpowered.
Im glad you liked the game and I am very happy with all your feedback! Thanks for playing! :D