Looks nice at the start but gets bad quickly.
First of all, certain upgrades silenty block other uogrades from being picked, for example you can't pick "more damage up close" and more damage far away" in the same run.
Second, skipping easy waves means losing out on power ups.
Thrid, upgrades from power ups max out really soon, so after wave 80-100 the only way to go forward is to grind puny +5% dmg upgrades.
The game also plays in a tiny window and offers some frankly ridiculous real money purchases.
for easy badge play the game using this link (loading levels within the game crashes it)
http://www.kongregate.com/games/damijin/pyro-ii?level=143289
also do not press skip intro or game will crash
 "Bubble Tanks 2"){kind=icon}
 "Deep Space Boss"){kind=icon}
 "Circular Tank"){kind=icon}
 "PewPewSide"){kind=icon}
 "Pyro II"){kind=icon}
 "Space Flash Arena"){kind=icon}
 "Magnetized"){kind=icon}
 "Strike Force Heroes 2"){kind=icon}
 "Front Runner Mobile"){kind=icon}
 "Watermelon Bomb (mobile)"){kind=icon}
 "Infinite Tower RPG Mobile"){kind=icon}
 "Cube Colossus"){kind=icon}
 "Endless War 3"){kind=icon}
 "Momentum Missile Mayhem 4"){kind=icon}
Blame the people who plays on 800x600 monitor and force me to scale down the game window.