The whole "synergy" thing seems to just equal "use a tile with that color and symbol on the wing". So, for "yellow and luna" synergy you just need to wait for tiles with yellow moons on them. Or am I missing something?
Too easy. In unlimited mode I pretty easily set up a 800,000+ (it's still going) combo. I don't think it's going to stop. I've been watching it for ~10 minutes.
I like this game, but I wish the training battles scaled with you a little better. I'm at a point where I can't beat the next regular battle, but each training battle I fight only gives me like 2% exp, so it'll take a looong time for me to level up again.
 "Ring Pass Not 2"){kind=icon}
 "Epic Combo!"){kind=icon}
 "Wings of Genesis"){kind=icon}
 "Sonny"){kind=icon}
 "Nuclear Eagle"){kind=icon}