This game is very difficult, and just maybe nearly impossible. Use arrow keys to move and the "v" key to shoot. The shield button has not been implemented yet, so do not even try. There is currently two bosses, both being dark skeletons. Boss one fires 4 arrows normally. Find out what boss 2 will do by getting there.
I had originally made this game on GameMaker. I converted it to Scratch so I could share it with other people. Sprites are just a random jumble that I either made or found. I may make a sequel to this game. There aren't really any aliens in this, so I think that would make sense.