I don't like the green guys...
Very nice game. Nice use of sprites. You mentioned that you weren't good at actionscript but I think you did well for a first go. I was able to beat BASS. He was pretty easy infact. For all those people who can't beat him here are a few tips.
1. When he turns red and glides at you just jump over him and shoot him.
2. When he shoots don't bother shooting him. It is a waste of time and you are definitely going to get shot. This is a good time to start powering up your shot.
3. When he is high above you, use dash to get away from him and while he is on the ground shoot him.