Nope, it's not Commander Keen, should have mentioned that actually as it was the first game I thought of as well. It's platforming only, nothing in the way of cutscenes, storyline etc.
It's predominantly a graveyard-style theme, the enemies are zombies, skeletons etc IIRC and they don't change much throughout the game.
It's predominantly a graveyard-style theme, the enemies are zombies, skeletons etc IIRC and they don't change much throughout the game.