I wish I was that good hahaha. I think the time between updates is more due to the right conditions, other than skill alone.
Since this is a remake, a lot of the work is already done, like the CGs, which would be the hardest part. The sound effects and many BGMs are reused from the original game as well and I’ve had help from people from time to time to speed things.
Since the last 2 versions, for example, I’ve had a friend help me with some of the features, which boosts a lot the development time.