Sorry for the late reply but this is actually a problem which I thought was fixed but creeped its way back.
To make this short, when an enemy dies of vore you don't gain any experience making you not stronger for the stronger fights. So sorry about that.
Secondly, the enemies have a 98% chance of dodging attacks but the player also has a 2% chance of missing. Apparentely, mixing these two together messes with the engine and it snowballs into like 20% chance of missing, which was not intentional.
Don't worry, once I can implement the fixed code and some more art for chapter 2 I will release these fixes to the public!