I was playing on Trivial cause I am bad at platformers like this... and at some point after the first mini boss it bumped me up to normal... what did I do? Had to start over on trivial.. I think I died cause I thought there was a game over defeat screen... and that might have bumped up the difficulty to normal. Just got through that.. and once I died... I noticed the game was harder. That was a weird bug :D
yeah... it was really weird... I continued...and then suddenly the game got really hard... I thought the enemies had a defeat animation, ya know? Continuing meant the mini boss had more health. At some point I go to menu and my save file notices it is normal. I really don't know what happened. It could have also become a freak occurrence. I was able to beat the demo at 3/4 Health upgrades. The last one is well hidden.