Hi, Lurl! We would love to put our games on mobiles, but due to the nature of our games, iOS is out of the question. Android, however, is still a possibility since we don't need to put our games on Google Play store.
Some of our new games already have an Android version. Night Attack : Beast Warrior (Japanese only for now) is available on Windows, OSX and Android in one purchase. Touch and Tease vol. 3 is available freely on the web, but the collector's edition let you play on Windows, OSX and Android.
As for Kemo Coliseum, it's possible to make an android version. In fact, when we demonstrated our game in the past, we made an android version so that people could see how the game worked on our tablet. However, making a game for multiple platforms cost a lot, as you already mentioned, and hence we would like to focus on Windows and OSX first.
Once the game is finished, I'll visit the android port again. But for now, it'll be desktop only.