4/5 Great game. My only complaints are managing the inventory and the fact that only bosses are immune to the Lethality effect. Makes it a little overpowered. Maybe make it so Undead are immune to it too. Other than that this is a great game!
3/5 Enhanced mode was good, but Adventure mode's where you lost marks. The random pits were highly annoying, the severe lack of fuel made it more than difficult (either grant more fuel from kills, grant increased amounts from combos, or make the fuel bar last longer). You probably could have afforded to put in more standard levels too. And the bosses were just annoying. I've had times when the final boss waits until I'm half dead before it shoots a single missile, and others where it won't stop shooting long enough for me to touch the ground. If you must have bosses have them appear after certain intervals of time in the normal mode, while still having the usual enemies flying around.
Ok, seriously? If you're going to make a boss that can destroy your buildings with one shot PLEASE make it so you can do something to stop it from shooting.
Great game. My only complaint is that you need to keep moving back and forth to buy the spikes. There should be either a quickbutton to place them or when you place one it should not deselect them. Other than that a definite 5/5