Wikipedia calls these swing piston or chasing piston engines, there is a quotation that "the swing-piston design combines all the disadvantages of the rotary with all the disadvantages of the reciprocating".
Swing-piston engine - Wikipedia, the free encyclopedia
This HYT engine design is targeted at providing an alternative to large sophisticated muti-cylinder diesel engines. According to a quick search on the web there is also a history of groups working with this type of rotary design for small car engines. The e-mobile hybrid uses a rotary chasing pistons design that, as far as I can make out from the graphics, is a spark ignition that fires once a cycle. In the graphics of potential applications for the e-mobiles engine it includes light aircraft.