Interesting game, but it has many flaws:
1 - where's the wave number information?
2 - U to upgrade and S to sell hotkeys would be appreciated.
3 - why the f***do the structures fade out when the mouse is not on them?
4 - the medium badge should be hard.
5 - the hard badge should be impossible (I haven't played it yet, but since the medium one is hard...)
Great game. 5/5
Only 2 suggestions:
1 - you could include a "shop" some places so we could buy/sell/trade items (I know it makes no sense to have a shop inside a dungeon, but it would be nice to go look for newer items).
2 - you could also include more enemy types and enemy combinations to make it less repetitive.
After 25 lvls +- I couldn't careless about deep analysing my items to equip my fighters... it became too easy.
The worst game of the series. Throwing weapons out to get new ones just suck. Changing weapons through "E" and "Q" was much better than that new freaking pipe on "Q".
Great music.
 "PlanetDefender"){kind=icon}
 "Music Bounce"){kind=icon}
 "Chronotron"){kind=icon}
 "Doeo"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}
 "Feudalism"){kind=icon}
 "Sonny"){kind=icon}
 "BoomsticK"){kind=icon}
 "Draw-Play 2"){kind=icon}
 "ZunderFury"){kind=icon}
 "You Have To Burn The Rope"){kind=icon}
 "MARDEK RPG: Chapter 2"){kind=icon}
 "Balloon Invasion"){kind=icon}
 "Understanding Games: Episode 1"){kind=tracking}
 "Monsters' Den"){kind=icon}
 "Thing-Thing 4"){kind=icon}