Reviewing the demo portion, I never had high hopes for this looking at the minimalist art style but I gave it a shot.
Gameplay - It reminds me of the old SNES days playing platformers but other than that it's a pretty basic platformer that doesn't offer anything new. I also got stuck a few times in the wall which made me die. The enemies are all unique and the leveling system seems alright.
Music - Probably the worst part, these aren't 20 second loops or even 10, more like 3 second loops over and over. The sound FX are much louder than the music and they sound pretty generic.
Graphics - Very minimal, I wish they did some more stuff. The graphics in the game, although not much going on, the sprites look great.
Overall a pretty basic jumping platformer RPG, I wouldn't mind playing it again if the bugs were worked out and perhaps putting pandora over the music in the game.
The platforming and the boss fights are awesome! Especially the last boss. I also liked the increasing difficulty that is nearly insane near the end.
The only downside is the music, which is the same one looped for the game, chaning only in the last fight, but you can just switch it off.