Yep, right on schedule. I think it was obvious back in late January that there would be a May release. He could have finished in March, but "things came up." Then when patrons paid up for April (because it seemed a release was imminent), he pushes the release to May. Not too early, or it would be obvious he's milking people. And not too late because patrons would cancel May and only restart if the game was released.
Don't get me wrong. I'm a big fan of the concept of patronage and crowdfunding. It's just that people need to temper their expectations. For one thing, you only get what's already released. Any and all promises are just promises until they materialize. If you like the creator and want to throw money at him or her regardless of being rewarded for it, be my guest.
But nobody should ever have expectations of an imminent release based just on some promises. And creators should keep that in mind, too, and never overpromise.