Summertime Saga has been without updates for 2 years, Timestamps: Lost Love has been without an update for almost a year now. So patience my friend.
It's not a matter of patience. It's a matter of whether or not you're naive enough to still be willing to pay for something without any promise or further reassurance of delivery.
At this point, if you're still subscribed to the dev's patreon then you simply deserve to be scammed.
Like I said before, folk's who don't pay can definitely wait for an eternity but those that do pay? You better make the right choices with your money otherwise you're enabling potential scamming practices to perpetuate.