I loved this! Agreed that it's definitely robotron-y, but having played that cabinet recently, I'd say this is more fun. :)
The minimalist art is really well done, and the sound effects were perfect and soothing. The ability to move around outside the walls as a strategy was a nice touch. I imagine the firing-mechanism was clunky-by-design? It felt really good to move that little mech-friend around!
This would feel really wonderful with controller support, if you revisit it after the jam. Great work!