Game is great! Went through pretty much the whole tech tree now (those last few shield upgrades are quite the price jump lol) and was a good time throughout. I'm not sure how the levels work though? Assumedly it just makes higher health atoms spawn but I'm not clear on what's increasing it?
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Thanks for playing!
Yeah the levels make higher health/atomic number atoms spawn and drain your shield faster, requiring you to do regular shield upgrades. Higher level atoms drop more electrons though so it mostly balances out, especially if you upgrade rod efficiency to get more eV per electron.
It seems I missed those final shield upgrades when I was doing a balance pass on the game.