bosses and a tip:
Guardian> stun main body or seal(seal is easier i think). spam attacks after he gets stunned.
Golem> use scanbot and see his waeknesses... different color is diferent weaknes. kill fire fist asap.
Worn> kill minor sand worm and spam ice in boss. later poisin is stronger and it spams it, dont bother using antidote, just heal.
Hydra> blind both heads asap (flare and unleash of heaven's gate). have 5-7 ressurection pots.
Tank> kill nazi asap. if he gets another laser canon or satelite, kill it too. if he gets ice canon, keeps ressurecting and healing till girl get full special bar, then just use it. if nuclear bomb appears, defend with warrior and give ressurection on girl. spam earth and thunder attacks on lower body.
AWAYS use bunny in start then get "bunny!" and "bunny!!!" upgrades.
idk how the hell i did it.. but my bro erased all, done the "only one" star and after that i got the stars he couldnt.. somehow got 25 o.0
and the last 2 star are probably in elevator and last one.. both hardest levels to get star