The Defence Buff is quite meaningless as they don't help to achieve 3 task(except the first one)
Even you increase your max HP, the task still only count 50HP
And even you regenrate your hp back, those counted will not decerease
It will be better if counting the percentage of hp
And the number of shot missed, not number of bullet missed
The Blue Tower is REALLY STUPID, it shoot all three attack at once but overkilled. Then it become useless for a few second. With such a land limit, they always let the Ninja PASS FREELY.
The control of the game is driven my crazy, it often moves to instead of one, which my block would stick to the other one.
It will be better if you add the reverse button.