I didn't play through the whole game, I'll finish it out and let you know what I think about the difficulty. Also, I'm noticing a lot of other games are cutting off menus for me. I have an ultrawide monitor, so I think that's is causing things to be off. I'm glad I found this out, I need to add some screen size calculations for my menu layouts.
Edit: Just finished game (THANK YOU FOR ADDING SAVING!) I think the difficulty was perfect. The only thing that could MAYBE change is the skeletons, they're not really scary since they don't walk all the way to the edge to hit the players. I don't this is a bad thing, it makes the player change to the wizard to do something, so I like that and making the skellies harder might be annoying in practice. Also, I noticed that the wizard falls half-way through the floating platforms, not a big deal. Other than that, really a great game overall especially for being done in a week!