At age seventeen, he made his senior league debut with ERC Selb in the North-East (Nord-Ost) conference of the Oberliga.

He did not record a point across fourteen games with the Ice Tigers and played most of the season with the Weiden Blue Devils.

[3][4][5] The Straubing Tigers did not offer a contract extension after the 2015–16 season and Ondruschka chose to return to his hometown.

[1][7] Named captain of the Selber Wölfe in 2016, he led the team to an Oberliga championship title and promotion to the DEL2 in 2021.

[8][9] Ondruschka announced his retirement from playing after the 2021–22 DEL2 season, in which the Wölfe successfully retained their place in the league.