You are SKURFF, pox ridden servant in the Castle of Oberon. You lead a life of drudgery in which you must:

In any order you wish: Impale the WubWubs onto spikes, eat all the dust and drink all the Beetle juice.

and then you must go to your mistress, Morgbella, for your 'night time' duties. Then next level.

Each screen has a cryptic clue title by NODROG, mostly for a bit of extra fun.

Extra screens are compressed with the excellent ZX7.

Greensleeves by Dr Thomas using Beepola.