I wish there was a way to sell tech points the way you can sell other resources. After being gone a couple of days, I've got ~ 2 trillion tech points, and the next purchase is at 50 trillion or so. I doubt I can get to level 4 without doing a reset, so all those tech points will go to waste.
Impossible to play with invisible villagers! :( 1 star because of glitches, others in comments have reported this as well. In addition, there is a Jsound copyright window half on the edge of the screen, and no way to close it.
To the Devs: Win XP Pro Sp3, Firefox 38.0.1, latest Adobe flash 1GB of Ram
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