I played the game for a while, and was terrible as Anguirus at first, mainly because Gezora (the squid kaiju) kept spamming its attacks and pushing me into the corner (which I learnt from to my advantage
). My next playthrough was as Mothra, which I completed 100% since she can fly
(and unlocked Kamacuras).
After that, it was back to Anguirus, and made it to the final level only to get beaten up badly by Monster-X not once, not twice, but THREE times! I gave up after that :/
My final playthrough was as Godzilla, but was not successful because Megalon kept trouncing me, despite my spamming Godzilla's radioactive beam attack :/ . I stopped playing after that.