Very interesting mechanics: it seems like a side-view Sokoban. Kudos for making something innovative while maintaining a Game Boy-ish style!
It's a pity it doesn't feature any sounds and music, but I know it's very hard without a sound designer/composer in the team. For making sound effects yourself, I suggest you to use "sfxr", I used it in a Ludum Dare and I can say it's great!