I agree with that so I stopped supporting. I will say though what they have done with the engine is a bit more than what most other devs have. There are so many that just take art/work for other sources and dump it into the same format with a bunch of writing where the game doesn't really feel original in any sort of manner. I think they at least in this aspect have put together a more refined game which can justify some of the time it takes to get an update out, but I will say in their case 4-6+ months even 3 is too long to wait for an update for this game.For the type of game and engine, actual updates have been far too slow.
I wouldn't give them money for this kind of pacing.
If they were able to at least provide a monthly update and progress shown this could easily be one of the better games in the space (and I would still be supporting them).