I finally reach the moon in my 9th day, after upgrading to e-rockets to max, and after I reach the moon, I just use the two charges I had left over, and reach mars. Well, just goes to show that e-rockets rule I guess.
Tip for the final bossfight, which is a Boss rush mode of all the 3 bosses. First kill the Violence Abolisher (the axe thrower), followed by the one with the mortars, who fires in your trench, I believe he is called the Peace Enforcer, and lastly the shield guy. This is because the bosses revert more to their old versions each time one is killed, so safe the easiest to avoid for last.
Quick edit: I thought there would be another checkpoint after Cactus Ride, but there is not, so use the doubler after at Cactus Ride, thus after the canyon
Fighting on Sherwood Forest level, the last wave, and they're breaking through, threathening to destroy my perfect score, and bam, suddenly masses of elven rangers emerge from the trees. Did not see that coming.