Can you show some context so that people can see how it works in the game?
If I'm imagining it right, I think the problems might be that
1. It looks rather flat, and therefore lacks weight. Maybe make it so that we can see part of its side or its top (or bottom), depending on the game's view/perspective style, to make it clear that it's a thick, heavy block,
2. It's a bit of a boring, generic shape, and communicates nothing about how it works or why it's there. Why not make it a trapezoid, since only one part of it needs to be big and flat to stomp, and the rest is just there to provide weight and a way to connect it to whatever mechanism launches it? Maybe add some visual indication of how it's put together in-world, like hooks for chains, belts, etc. You could also add some indications of what it's done in the past - is there dried blood on it, or maybe it's chipped from hitting some past adventurer's magic armour? You currently have chips all over the place, and as a result they don't tell any kind of story, and so they don't look very interesting.