Just shoot than move on to the next waves. There is a global leader bord. Some enemy like the hen and unicorn have more health and will take more shots to kill. You can also try going around the enemys but it is not recommended because they are close to the end and will most likely kill you. You have one life and will get one shoted by everything. I might add lives in a future update but im not sure. also both holding down the mouse and using the space bar work to shoot. Use the mouse pointer to aim the shots and move around with the arrow keys to move.
i just coded this from memory and from what i new I hope you enjoy!
