I really like the visuals albeit maybe a little bit too much post-processing for my eyes lol, music is good and everything is clean. I especially liked the lighting being effected by the boxes I placed.
An absolutely must for any puzzler game is a way to restart quickly, players shouldn't have to jump off a ledge to restart the level.
Were you checking for objects above before allowing jump? the jump kept stopping and starting and the only times it happened was when objects were above me to my left or right.