If you strike an enemy without any weapon, the sound you make is that of a
lightsaber.

The wrench sounds the same.

glass wall breaks with an explosion sound

Hunting knife sounds like a lightsaber as well.

Downgrading to bug.

Looks like for attempted melee attacks:
hit = lightsaber
miss = wiffle sound

ranged shot = special sounds or willle sound.

sound/effects/bullets/Sword.ogg could be used for clubs, swords etc.
swing_then_nohit_[1-4].ogg could be used as bare-hand attack.

Progress:
http://soundcloud.com/soggytoaster/sets/freedroidfx/s-3lvjS

ahuillet, I've created a few new sound effects for the game as accessible by the 
above link. As for "glass wall breaks with an explosion sound," I've opened a new 
issue for that. See: http://bugs.freedroid.org/b/issue595

The sound effects are good. Shall we commit them?

If I may make one comment about them however: they feel like you're hitting an
empty metal box, I suspect the bots are much "heavier" than this.

Ahuillet, yes. These can be committed. I will work on the effects more and more 
over the course of the development cycle leading up until the next release to 
get all of the sound effects in the entire game to be perfect. :) Or, as close 
to perfect as I can possibly get. This is one of my project goals, to get all of 
the sounds in this game up to par. In the meantime, I'll make more deeper sounds 
so it sounds like you're striking something much heavier.

Michael's sounds were added in commit 6268e7. Thanks!