I've been in contact with the lead Tesseract developer for some time and with the game being scriptable to allow for automated benchmarking, of course, it means I'll give it a whirl. I've been experimenting with Tesseract for a few hours and it's already been incorporated into the Phoronix Test Suite and OpenBenchmarking.org.
It's as easy as running phoronix-test-suite benchmark tesseract to automatically download, setup, and run a fully-reproducible test case of the game for comparing hardware, drivers, or other components. The test profile page is on OpenBenchmarking.org. For those that have yet to dive into making your own automated test-cases or wish to contribute new tests to our GPLv3 benchmarking software, here's the raw test profile.
Here's a quick benchmark of an ASUS Zenbook Prime UX32VDA with NVIDIA GT 620M graphics on the NVIDIA Linux binary blob against Intel HD 4000 Ivy Bridge graphics with Mesa 10.1 from Ubuntu 14.04... To some surprise, the Intel graphics do well against the discrete GPU with fully-capable blob driver, but I'm still exploring Tesseract to see how it runs across a diverse spectrum of drivers and hardware.
You can see some more Tesseract game benchmarks on Ubuntu Linux via 1405130-PTS-TESSERAC04.