on some FPS games where this is done, it looks INCREDIBLY awkward seeing your limbs when you disable the motion bobbing on the game.
since blockland already dosnt have this bobbing effect, it may look really handicapped, as your body floats and slides around. viewing your limbs from first person will make this far more noticeable rather then the 3rd person view we can already see.
its a common lazy indie developer issue. either add the bobbing, or better animate the body.
and blockland already has "legoish" stiff bodies, so bobbing wouldnt work well without bending knees and ankles; simulating a raise and lower the view.
IMO, the aesthetic may be ruined some if we can see our limbs, based on how we currently walk.