Looking for Donjin company's Tachyon タキオン all game

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So strange,I’m Looking for this Donjin company's game for many years,but in the internetcan't find any information
even DLsite can't find any game was existed trail
The only information it's on VNDB page タキオン
Does anyone know what's happen?and I Hoping to find all these game and release them
Some including these

Tsuntsun Loli Loli

つんツンろりロリ

Ona Kan ~Chiisana Kanzume~

オナ缶～小さな缶詰～

Tsuyoki na Imouto no Iru Seikatsu

強気な妹のいる生活

Nandemo Iu Koto o Kiite Kureru Yui-chan

何でも言うことを聞いてくれる唯花ちゃん

some of them can find CG in https://hitomi.la/group/takion-all.html
anyway the game is no where can find