When the first budget software was put on the market there were screams from the established software houses that it would drag down the quality of software to a level where it would be detrimental to the consumer.
Mushrooms From Mars is a game that gives justification to that claim.
The game starts off with a Donkey Kong-style screen, with horizontal bars running across the screen and ladders connecting them. The aforementioned astral mushrooms charge down these bars and you must run and jump over them in an attempt to reach the top. The control and jumping action is dreadful and takes quite a while to get used to.
You then progress on, and so forth. On the inlay card, it says "nothing can stop them". I hope somebody does.