Beetles

Z is to start obviously 

X is to shoot 

C is to blow up your enemies 

Watermelons are very useful, when you stack about 5 you gain a life if you end up losing one. You can either wait for the right moment to gain a life or you can be a tryhard and not use any. You can also use them for bombs, if you hit C when you have about 1-4 watermelons depending how much you have will be how much power the bomb will be.