What happens when you cross a gas turbine with an internal combustion engine?

Inzkeeper writes: Here is another radical replacement for the traditional combustion engine.
Check out the Astron Aerospace H2 Starfire Omega 1
. Astron Aerospace is makes turbines for commercial jet engines.
However, they have come up with a novel way to make an ICE engine with a turbine configuration.
This raises engine thermal efficiency from 35% for ICE engines to 80%.
From https://www.hotcars.com/omega-...:

Even though the Omega 1 is around the size of a regular sewing machine, it packs a punch well above its weight. The entire engine only weighs in at around 35 lbs and the system produces in the region of 160 hp and 170 lb-ft – around the same as a non-sporty turbocharged 2.0-liter 4-cylinder. Unfortunately, Astron Aerospace is not able to tell the cubic size of the engine, but we expect it to follow the traditional rotaries’ smaller capacities.

Although there is a working prototype, there are still many hurdles to overcome to get this to mass market.