Interesting how combining 3 overdone and rather tired flash game "genres" (side-scrolling driving, repetition-based "launch" games, and zombies-killing) somehow resulted in something that felt fresh and fun.
I have always felt the warbonds are heavily overpriced. A little economics 101 for the developers: Lower the price just a little and a lot more people would buy them. Both sides win.
For me, one of the most important features of a game is a sense of agency for the player - that is, the feeling that one's skill in playing is actually affecting the outcome. Unfortunately, this is something that the Epic War games have lacked since the third game, and number 5 is really no exception.
Consider the basic war bonds purchase - 60 for 100 kreds, ie. $10. This means an energy refill (10 war bonds) costs $1.67, and a new card on the front page (20 war bonds) costs $3.33. That's pretty steep. I've bought entire games on sale for less than that.
A fun and simple game with nice historical attention to detail. However, it's really unfortunate that the developer decided to make virtually all the planes unavailable to non-paying players. It seems like wishful thinking on their part that people would spend that much money on this game.