the red and black circle is a speed boost, the blue things are zombies and you can kill zombies by using either gun. 1 ( press one to get it ) or by using gun two ( press 2 to get it ) your health is at the top in blue and press p to get upgrades and press x to close shop. purple is a safe area in which zombies can’t get in but you can’t shoot zombies from in there, the black wall is the city and you can’t walk through it and the orange stuff is lava ( you'll lose a life ). wolves are like zombies but they just look different
warframe for making the YT vid
