Jacky Lucky (1992) (Bon Treasure)

A pot-bellied dude with a stick walks around the levels and smashes everything with it - enemies, stones, and just air (there's nothing to do!). Enemies, of course, die (but not all of them!), and stones - leave behind valuable things: mushrooms, stars, rings. Feeding on them, you can learn to shoot or become invulnerable. At the end of the levels you will be waited by quite fun bosses (who would have thought that the first boss will be a regular bull!).
In general, you can play.