The design looks horribly plain.. It's just a box with stick legs.
Make him more mechanized, add elements to make him look like a machine that actually works; especially on those legs, what's making the plain sticks move? Go google AT-AT's and those mech walkers in the Avatar movie and use them as refs.
Needs more upgrades too when it comes to usefulness.. Example, how will he turn to the sides? Right now his abilities seem like those of a pawn piece in chess, but without the diagonal attack.
Not to mention armor, attacks, the obvious vulnerabilities, ect.. Imo, a re-design should be the priority now.
This should help you get started. Unless these were your original intentions.. it's your call.