Changing the controls made it tolerable, but still not great. I made it through the content in the demo at least. There's a brief period after you land where you can't attack for some reason.
The platforming is in an odd place where almost every jump has to be a double jump, but dashes are underutilized.
Every enemy encounter is the same button mashing because they just get stunlocked unless you space yourself slightly wrong, or they launch an attack with no warning in the case of the hovering egypt enemy.
The level design is a lot of nothing. Jump along and mash the punch button when something is in front of you. Very linear except when there are two ways to go and you have to go to one of them first and then backtrack (double backtracking if you arbitrarily picked wrong first). Moving platforms exist only to make you wait.
The slime boss is... strange for a first boss, being the hardest by far of the three in the demo, as well as the most counterintuitive. Its behavior completely changes at a certain point and then you have to figure out that you have to avoid where it appears because of the splash attack, but the red attack makes it vulnerable beforehand. The mirror witch is ridiculously easy and the pharoah boss is alright apart from the tell-less attacks.