If you're interested in "Slash it 2" DLCs, there is couple more:
Slash it 2 - Electronic Music Pack: https://www.steamgifts.com/giveaway/1LV4K/slash-it-2-electronic-music-pack
Slash it 2 - Russian Edition Pack: https://www.steamgifts.com/giveaway/2JTv6/slash-it-2-russian-edition-pack
Slash it 2 - Chinese Edition Pack: https://www.steamgifts.com/giveaway/QYAsT/slash-it-2-chinese-edition-pack
Slash it 2 - German Edition Pack: https://www.steamgifts.com/giveaway/2sc5s/slash-it-2-german-edition-pack
Slash It 2 - JanjiMusic Exclusive Edition: https://www.steamgifts.com/giveaway/J4Rap/slash-it-2-janjimusic-exclusive-edition