Very uncommon for a standalone game to be this popular, but in this case the popularity is 100% deserved!
Incredible work on the visuals and soundtrack, and I really appreciate the autofire feature (something a lot of games - including mine - desperately needed).
My only criticism is that the attacks could be balanced a bit better. For example, despite the autofiring, it's still technically better to just spam click since you end up shooting faster. A way to fix this would be to either clamp the fire rate so spamming doesn't work or have the autofire gradually increase fire rate until it roughly matches what a typical player could do with spamming. Also, the bomb/explosion is a bit overpowered and should have a cooldown attached.