Most games have a delete/sell unit/tower option. This game does not. Lag + misclick can be fatal in this game because of that fact. (Can turn a game you were about to win into an impossible to win game due to abilities such as absorb and a misplaced unit)
Well, all can say is it is pretty glitchy. Most of the achievements were easy and I had all but the 5m points finished when I had to close the page and reload. I lost all my work the first time. Second time I lose all but the first few minutes of playing. (Achieves weren't being saved right, nor upgrades).
The blue ship is better for dodging and pinpoint strikes (good for armored enemies) while the orange ship is better for hitting a large batch of enemies. Orange ship is harder and shouldn't be used unless you know exactly what you are doing.
Most of those high scores are impossible. I hit around wave 40 without dying and could only get 7 multiplier so how could anyone get 36,500 multiplier?. There are only 18 feats yet people have 25?. The max wave (95,472,231) right now would take well over 100 years to achieve assuming each wave took one minute to complete (I calculated that it would take well over 300 assuming 2 minute waves and 1000 years based on how long it took for me to hit my max). Some guy had 10m points and barely finished wave 40 while another person finished wave 75 and had around 4m points.
Horrible horrible system but good potential. Sorting through cards is a pain. A "locker" system for putting away less used cards would be good. So would a system where each deck is separate (as in doesn't use the same pile but uses their own pile of cards). Also, not changing the decks when you are editing the decks. And having separate decks for arena, missions, and faction wars (as in let us choose which deck we want to use where and make it so we can switch them individually instead of all together.
 "Protector IV"){kind=icon}
 "Battalion: Vengeance"){kind=icon}
 "Chibi Knight"){kind=icon}
 "Endless Migration"){kind=icon}
 "ZunderFury"){kind=icon}
 "Tyrant"){kind=icon}
 "6 Differences"){kind=icon}