It varies depending on dialect, and in fact there is no standardized spelling for Swiss German, but people would likely say something like "guet gschaffe." Note that educated Swiss all speak Hochdeutsch (High German) as well, in which that phrase would be "gute Arbeit" or "gut gemacht."
You say either "Merci" like in frensch, or "Danke" like in german.
In general you say "gute Arbeit." In "teacherese," you might also see "eine gute Leistung" (like on a grade report).
a very informal answer:
Bitte
(pronounced "beat-ah" similar to "pita")
Danke, gute Arbeit
well done = gut gemacht
good luck = viel Glück
no problem
Good luck with that = viel Glück damit
In High German it's "Schmetterling"; in Swiss German they also sometimes say "Sommervogel."
"Viel Glück"
In Swiss German flowers are Blumen.
Ig
Schweizer
Viel Glück !
In Swiss German, you wouldn't normally say something that literally means "have a good day." People do say "gnüss de schöni Tag" (enjoy the nice day), which is very casual. You could also say "ne schöni Tag" or "ne schöni Tag noa." But generally the normally Swiss German good-bye is "Wiadaluaga." Even so, it's also just fine to use the High German "Auf Wiedersehen."
volk
STRASE
Flugzüg