Are there any plans to make a apk/Android version of this game? If so, is there a expected date for the release
Sorry, I have no plans to release an android version. I don't have the environment to do test play on android, so it's difficult to release.
I am aware that there are mobile players. I can't release all characters in the browser version, but as I add more character packs, I plan to increase the number of playable characters.