This was a pretty weak demo all around - a combo of the enemies not moving and Oggy's spammable bash attack oneshotting everything (except the boss) made the game insultingly easy.
Audio and visuals were also pretty poor, too - the visuals are a mixture of ripped images/random shapes in MS Paint, and I couldn't find a single piece of SFX you didn't rip from elsewhere.
I also found that you didn't reset the coin/life counters after the demo finishes and that going off the left edge of the map causes Oggy to fall forever - those are both pretty serious oversights.