If I wanted to play robot kill, I would go ...
...and play robot kill. your technical skills are not in doubt ,you ppl know your stuff. I only wish you added more of yourselves in terms of gameplay, dont know try to make enemies a litle more smarter, when an enemy fires at you you fire back and move to find cover and wait and then fireback again, the enemy should do something similar, they just rush at you firing in the most suicidal way possible which isnt cool at all.
also let the enemy carry as many weapons as the player can, it would make things interesting.
very important a couple more musical scores, and the weapons found effect is kinda bland you should find better sounds .
also more interesting weapons, the rockets are ok but what about heats seekers, flamethrowers, incendiary rockets maybe , mines, emp rockets etc.
also boss fights throw some ace pilot robot at the player or some giant weapon system or a massive tank.
you guys need more games for references other than robot kill, what about mechanical commando? or 3000AD? those games even though follow similar mechanics , they tried to be original and ended up feeling like their own rather than a mere copy of another. think about it.