This game is almost impossible to beat without cheating! But the boss was fun, even when I was cheating. Because I couldn't shoot when I was hit, it was a fun challenge to bet the boss quickly. It wasn't about if I could do it or not, as I literally couldn't die, it was about how fast I could do it.

I found it annoying how I sometimes just couldn't move vertically and sideways to dodge enemies, but I think I can guess why this is; This is actually a vertically scrolling shooter, like Xevious, where the players movement is limited to a box. However, instead of having the view of the camera imply where the "box" is, the camera is attached to the player and the "box" is invisible. I suppose it's fine to remind everyone why designing the camera to show where the player can move has been a staple for 40 years now :p

Fairly impressive ^_^
I like how even in 2 days you managed to properly tutorialize things.
I second on making asteroids easier to destroy, and also add that invisible walls on the sides can be very sudden when one is trying to maneuver.

It would be more fun if the astroids could be destroyed in 1 hit, they always spin around so its hard to destroy them. A game with the best strategy to run away is a bad game and also destroying stuff with1 hit would make you feel more powerful and encourage destruction.