Maybe a bit too simple, but you can add more elements (like different enemies or weapons/ammo types). Nice!

Cool idea! Wish the flies were a bit bigger because the art looks nice. Maybe slower too, the way it is now just spamming the cannons works.

Some death animations and particle effects would really finish this off nicely as a simple mobile game

The idea is fun but there are some issues with the execution. You can just spam up and down constantly and not even looking at the game and still be winning - which makes the game less fun and engaging than it could be!

The game is fun to play and catches upto mood even though killing all mosquitoes is not possible, as canon movement is not in our control