I really like the Cover Image and short Description, good Job! I don't like the tiny window starting size and title text on the left however, but I can just drag it bigger, so all's good.
Play button doesn't loose hovered state when moving the mouse over the Quit button, or just in general away from it.
Nice Pixelart, clean looking menues, but maybe a lot of empty parchment on them, especially the special effects are really clean, good Job. (Also cute toad)
Bats are insanely easy to defeat thanks to them floating up a bit before actually swooshing down on you, but thats not a bad Thing, considering the skeletons attacks just keep bouncing.
Alchemy screen seems to alter Attack element, but doesn't really affect anything apart from the looks yet? Or maybe its just not noticeable.
There wasn't really any Time I actually had to Jump, felt odd. Maybe adjust future levels to force the player to jump in order to reach some enemies or something?