Chimera Software isn’t dead, he’s trying to remake Starbse Orion in Unity to release it in more places. The Kickstarter failed completely which didn’t help.
Naval Tactics never took off - the Tactics part of that was super obtuse, and never really latched in with a lot of players (my lay group especially - the formation bonuses weren’t really explained, the card system felt tacked in).
There was also a card game (Annex) that also failed.
It doesn’t look like he’s dead, just in hibernation.