i think if it wasn't for the super low heath the helicopter would've been the best ship. three guns, easy to dodge bullets and its cheap so you can buy great guns early. i beat every level with the helicopter until the last one
first chapter is really fun but then the second gets harder than hell, if they ever make a third one they should just make the same kind of game but tweaked so its better
killing baal on any level is easy, just use ur shield, attack boost, critical boost, and titans all at the same time. if u wait at ur castle until ur mana is maxed and all ur titans are out u can kill him fast