Press space to attack. 1 second to reload. Press w to shoot a laser wave. Press down arrow to put a barrier with limited health that damages zombies. Use arrow keys or A and D to move After shooting a laser wave, if you press the up arrow you will turn it into a nuke, killing all zombies on the board. This has a significant cooldown.
Dinosaurs spawn every 8-16 seconds. Shoot them to get 5-15 points. A firing speed powerup spawns around every 17 seconds. They change the firing cooldown from 1 second to 0.65 seconds. You have 3 health. After losing health, you have 3 seconds immunity. Shop and levels are not added yet.