Music was...

having that kind of music all the time was a bit annoying. Good game though. I thought the difficulty was about right but I'd like to know the high scores (is there a high-score function?)

What worked well for me was upgrading one cannon for the most part and having the other one weaker. Of course, it got a little hard when enemies came to the other cannon's side, but just by accounting for the distance between the main cannon and the enemy, I could hit them allright and usually with both shells

I tried it on medium...

And it was too hard, i even upgraded only rate of fire, no luck. You've got to be kidding me. I made it to the second level and just said no fricking way. I like challenging games, not games that make me cry lol.

Nice Visuals but Not that Exciting

The subject says it.

Nice!

Fun game, a bit too short/easy.

For those who say this is too hard

I managed to beat this on my first try. My final score it said I only leaked 4 enemies. The trick is to not upgrade missle speed. Fire rate is the best way to upgrade, It allows the most damage done as many enemies are low armored and rarely get close enough for explosion boost to work. I also kept my upgrades even on both cannons.

To improve this game I'd recommend a free play mode, maybe weapon effects added, freeze or poison. Also making the upgrades equally valuable would be excellent.