It's important to take breaks, especially as a solo creator. Think it's wonderful that you're allowing yourself a sense of creative play again through this exploration of a side game. Heck, anybody who loves your cast of characters certainly aren't complaining! (It's nice to see other 'sides' to your characters' lives and personalities, and not just...their suffering, lol xD).
As for burnout, it's definitely an experience I can relate to (experienced it twice actually--with one resulting in a hospital stay--but sometimes you gotta repeat a lesson to truly remember it, aha~ |-D ).
Expanding beyond (often self-imposed) tunnel vision is important. While commitment, plans, and structure is important... life still requires a balance of exploration, play, and experimentation as well!
Anyhow, thanks for telling us how you're doing. Truly. Please continue to take care of yourself in whatever that best means for you. ^_^
AND JUST HAVE FUN WITH YOUR SIDE GAME, YOOOOOOOOOOOOOO~!!!!