JASON JUPITER - Original by Neil Drage in 1989, ported to MMF2/Java by David Newton
The original EXE can be downloaded here - you'll probably need DOSBox to run it.
Click on the applet to set the focus if it doesn't respond, and give it a minute to settle down if it still doesn't respond.
Controls:
O: Step Left
P: Step Right
Hold down Q and press a direction to jump
From the original readme file:
Jason Jupiter has been called in on the deadly mission of decontaminating the planet Shufti-Arquar III by the Galactic Federation. The fragments of radioactove borxidium naturally form the shape of a golden heart when open to the air.
Unfortunately Jason couldn't get to the planet quick enough to stop some of the creatures on Shufti-Arquar III becoming terribly mutated and ferocious. The main offender is called the Glutanous-Green-Groted-Gronge. This wasn't the most friendly creature in the first place, but now its too ferocious to describe. (By the way don't let its name deceive you, it's Purple). Another mutation that will cause Jason a problem is a plant called the Horrible-Herbaceous-Headeating-Honkhider. One touch from this and it gets the taste of your flesh.
Collect all the hearts on the screen, then get to the E.