Generally difficult, Souls-like games aren't really my thing but I'll take a shot at reviewing this.
I kinda get where you're going with the whole "discovering ruins" take on the theme, but it would have been good to put a little something in the game to explain it. Even just a little text at the start would have gone a long way. Theme -- 2/5
I actually enjoyed playing, despite it not being my usual type of game. Only a couple of my deaths felt "cheap", and the levels felt challenging but relatively fair. Fun -- 4/5
The controls seemed fine to me, although I think it was odd that holding the jump button made the character jump every time he hit the floor. Also the player seemed to stick to the ceiling sometimes? Controls -- 4/5
The graphics looked pretty good. A little on the minimalist side, but not in a bad way at all. I did notice the platforms seemed to clip behind some bits of wall and in front of others, but that's a very minor gripe. Graphics -- 5/5
The music and background sounds were really nice, but I thought it was sad that the music only played in levels 3 and 4, then went back to the sounds for 5. Additionally it would have been good to throw a little variety into the music for each level. Not a whole new track, but something like adding some reverb on one level, using a low pass filter on another, etc. Finally a sound effect for the player dying (and maybe reviving too) would have been good. Audio -- 3/5
I didn't really notice anything in this game that felt new or original. Originality -- 1/5