Game is amazing! Have a few problems - For some reason I got tier 3s before my sniper bot was even tier 2, maybe a bug? Also, the top left robot selection thingy moves around when you walk. I am pretty sure this is intended but I am notifying you in case it is a bug.
Finally, the game is really easy. If you survive the first few guys (basically until the big six side shooting outwards close range slow dudes come in, or tier three bad guys) you probably have high tier robots enough to destroy all the baddies easily. I also have no idea what tier five monsters brings in, as I saw no difference and the game was still really easy. Pop down a few turrets and you win. Maybe a bit more balancing should have been done, but all these criticisms are for full fledged huge games, while your game was made in a week! Amazing job for a game made in one week and this might even be my favorite!