Sonata Arctica's fourth studio album Reckoning Night contains the song "My Selene" composed and written by Liimatainen.

[7] Nowadays, Liimatainen plays guitar in the band he founded Cain's Offering, whose first album Gather the Faithful was released in autumn 2009.

[8][9][10] Liimatainen has a band called Sydänpuu with drummer Risto Koskinen from Kemi, where he sings and plays guitar, bass and keyboards.

[13] Starting in 2015, Liimatainen worked occasionally as guitarist-singer Ville Friman's accompanist on Insomnium's tours.

[16][17] In 2016, Liimatainen started collaborating with former Nightwish singer Anette Olzon, and the first album of the resulting The Dark Element project was released in November 2017.

[20] Liimatainen has composed the song "River Runs Dry" for the band Sturm und Drang.

[23][24] In October 2007, Liimatainen played guitar in the backing band of Paul Di'Anno on the singer's Finnish tour.