HAHAHA I broke it on the level (first one?) where you have to keep up with the platforms. I climbed the wall just above where the platforms stop, got on top of the world and ran over it to the right (above the "treasure room") and then jump dashed against the right side of the screen and it slid me to underneath the world and I could run back to the left and see the bottom of the level. Had to use the B key to get out of the level.
The intro guy stole my money when I prestige reset and bought my first guy, then he gave me the small starter amount again, so at least he tipped me after he robbed me. =P
So my museum doesn't save the items I've 'donated' unless I don't close this page. Like if I play 5 or 6 runs, it will all be in there, but once I close this tab, it resets. :(
I got 100% before I even got the 8 games played award. Here's the trick:
Once you get your starting money up enough: lvl 3 ship (100+500), level 3 chest (500g), level 2 chest (250g), and level 2 flag (500) (2350 total) you'll wrack up so much money in the first 2 waves that you can max out your attack stats right before the 3rd boss, blows him away pretty good, and you'll get tons of experience each game from all that loot. Have fun!
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