So, the game (or actually the earlier part Jump on Mushrooms) was mentioned in Super Play, a Swedish gaming magazine, in an article about experimental games.
You can see the article in www.hempuli.com/JoM_in_Super_Play.jpg
Thanks to DimJimma at TIGsource for telling me this!Here's a rough translation of what it says about JoM:
"In a mario-esque game with the fantastic name "Jump On Mushrooms: The Game" time goes backwards. Every stage begins so that they're already completed, and to get back to the beginning requires precise planning.
To play a game backwards connotes certain differences when compared to playing it normally. For example you can jump as high as you want (because you're actually falling). On the other hand you get a game over if you fall from too high (because you couldn't have jumped so high in the first place). If you anti-collect too few or too many coins compared to how many you had in the end (beginning), you get also a game over."
Hmm. That mostly just described how the game works. Oh well.