Ok, here is my project of 6,5 hours.
It's still in progress but has 4 levels (if I remember right... )
You control that green thing with:
Right: move right
Left: move left
Up: jump
Space: shoot
You must avoid the potatoes, they are bad and take your health.
Game graphics are made with Inkscape and Paint...
And ground and wall graphics are from caveman demo (I try to get new version with my own graphics... )
So, enjoy!
(EDIT: By the way, the zip file contains window and full screen exes.)