The Simpsons: Bart vs. the Space Mutants (ZX Spectrum)

The Simpsons: Bart vs. the Space Mutants Screenshots

ZX Spectrum version

Load screen
The alien threat
The game starts here. That purple thing will have to be painted
Using x-ray goggles
Three bouncing aliens to get past. As the game progressed they seemed to bounce lower making it harder to get past
I need that spray paint on the windowsill. I can usually jump onto the blue window surrounds, but this seems to be as high as I can go
... and bouncing on the litter bin gives an extra boost
Got it
So here I am spraying the litter bin and nothing happens. Turns out it takes a lot of paint before the colour changes
Done it
I tried spraying the poster but my paint ran out. Perhaps there's another way
Dropping washing on two toys disguises them
I can buy keys and spanners, but where do I use them?
No need for sarcasm