If anyone has problems with lvl75: Accumulate as much as possible in the top left jelly. When you get around 150 take the top lab. Wait till the boss is under 100 and fire with lab. Labs fire really fast. If you can take the boss it's easy sailing.
This game doesn't work in most browsers for me. I tried IE (just a white screen), Opera, Firefox (both green screen that loads and then stops working), now I tried Chrome and it works. Hopefully everything works in Chrome as I've had experience that buttons stop working with games in Chrome.
A few tips - before you upgrade your company, make sure you have hired the maximum possible employee number on each floor. Always upgrade your company as soon as the time hits 0:00 (longest possible time till next salary). When you upgrade your company the first upgrades should be in the Sales department. ALWAYS keep 2 days of salaries! Follow these tips and it's pretty smooth sailing even on "HARD".
The tip - don't waste any clicks is bad. I did that and never managed to finish the game. Best way to do it is: 1) when you find mooks, kill them straight away, 2) when you find the damiyo, kill him straight away - If you do this, all remaining clicks are converted to EXP with a bonus. So if you have 10 clicks remaining you get ~30 EXP points. 3) get the archer, upgrade speed and damage (you can't max all so don't even try) 4) don't forget to upgrade your samurai equaly - damage, life, speed. 5) of the buyable upgrades get the Expert Tracker, Focus: Chakra (don't forget to use the double), Mercenary Armor, Quick Strike and Light Feet (the frist three are a must, the last if you can get them). If you uncover and see mooks on (uncovered) rice fields it's good to kill them also, because you convert the click to health, chakra and silver. It's not worth exploring for mooks if you already found the damiyo, unless the remaining number of mooks is larger than 50!
The controls work well, but the action takes time, so you need to time it correctly. I posted a youtube link in the comments. I'd say it's the easiest way for the hard badge.
Stupid hard badge - I got MORE than Gold on every level and I'm @ 1860. --> Btw got 1905 but still think it's stupid to set the hard badge @1875 when it should be at a score = all gold
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Try to refresh and re-load your savegame.