great idea! good youtube video!
some suggestions:
when entering a new level, it should be easier to find your character. maybe a short animation would help. it would also be nice if enemies could not spawn on the same tile you spawn on or if they had some small cooldown before being able to move.
it might be cool to have some special item or chest that spawns in every level, that disappears after a certain number of floor movements, so you have to really think about what moves you make.
exploding barrels would also be cool.
very cool game though, would love to see it being developed a bit further in the future!