Good platformer, you can see there was effort put into it. The reveal feature is implemented really well but, as was pointed out, this just feel like what Brackeys did for a previous game jam.
I have mixed feelings about the attack system. I feel like you should just be able to attack in the way you are facing. I struggled keeping the mouse forward as I was moving so I attack in front instead of back. I haven't reached far enough to see if hitting backwards while moving forward is useful.
Made it to the first large room with single tile landings, missed the jump twice, had to start over the whole jumping sequence and gave up. It's really hard with a keyboard.