The first 19 levels were doable and I didn't have much trouble solving them, but that final level was insane, it took me many hours and thousands of combinations to solve it.
In case anyone else is losing their mind with it too, here's the solution (the red square on the top is the green one).
https://www.newgrounds.com/dump/item/f91849fa3d0f61e88854ccffbb9fda81

Nothing works, it's just stuck in the menu. I've tried 3 different browsers and all with the same result.

I'm not usually the kind of guy to do the math but I've made an exception here just because of that crazy 10 million of money medal:

- The best level to go for that insane medal is the girl zombie one, cause it's the timer-based zombie with the most health (599). Remember that you earn 1 coin per health point damaged, and that if you kill the zombie you advance to the next level, which resets your money.
- The timer lasts for 10 seconds, but there's also a 2 seconds stop at "Time's up", so every 'reset' lasts for 12 seconds total.
- Of course I could click the zombie myself 10 million fucking times, but yeah I think I'll pass. So the most optimal way to make the most out of every 'reset' without moving a finger is buying and upgrading team members to deal the most damage per 'reset' without killing the zombie.
- The giant robot (the one that costs 5k coins) attacks only once per 'reset' and deals 300 damage, but if you buy it 3 times (first buy and 2 upgrades) it deals 500 damage.
- Now for the rest of the health (99 hp) you would buy the shotgun guy a total of 7 times. The shotgun guy deals 2 damage every second the first time you buy it, and it deals +1 each time you upgrade it. So it would do a total of 80 damage per 'reset', making it a total of 580 damage and leaving the zombie with 19 hp before time's up. I wouldn't recommend upgrading it more than that, just in case it did some extra hit due to lag or whatever, accidentally killing the zombie. Oh btw, the shotgun guy takes one second to attack after "Time's up" is gone, so make that 13 seconds per 'reset' instead of 12.
- So, doing all the above mentioned, which is buying the shotgun guy 7 times and the giant robot 3 times, you'd earn 580 coins every 13 seconds. Now for the math part:

10,000,000 coins ÷ 580 coins per 'reset' = 17,241 'resets'
17,241 'resets' x 13 seconds per 'reset' = 224,137 seconds
224,137 seconds ÷ 60 = 3,735 minutes ÷ 60 = 62 hours

Yep, that's a whole 62 fucking HOURS of doing nothing but stare at your screen just to get a 25 pts medal (well, and the 10 pts medal for reaching 1 million of money). Of course you can leave the computer on and go do something else, like going outside and being productive (LOL). But it's still 62 hours, with no margin of error (an accidental click, a sudden lag, etc could kill the zombie and there goes all that precious time down the toilet). So yeah, unless I'm missing something I think I'll pass.

Each time I listen to this, it only gets better and better. Some parts are simply an eargasm.

This deserves way more recognition, it cheers me up every time I listen to this song.

I always listen to this when I feel sad. This is amazing.