U play as a robot and u are fighting against alien monsters. in the game u can pick different wepons that spawn near u and after the wave u can also upgrade them. I remmember that at the beggining of the game u spawn near some scientist and he is talking to you something. And i also remmember that some waves u fight against giant spider...dinosaur...and the last wave is against some witches. I really hope u know what game it is 
