Superb graphics! It shows that one can do good OpenGL 2D games, something I wondered about.
It is quite fluid even with lot of particles, even on my old computer, which still suffers from some freezes.
I also find annoying to play with applets because then mouse goes out of the applet, we loose control and don't see immediately where is the mouse to put it back in the applet.
Reached stage 8 on first try, I appreciate the increasing difficulty.

Very nice! The graphics are very good and it plays without a glitch! It's a bit tricky to play as an applet because of the mouse pointer problem but I get to stage 10 as well.

Andreas

http://www.dstgames.com/games/applets/bossx/DST-BossX-Source.zip