I think this thread is about the ‘new’ CastleBoy. We still have the thread about the CastleBoy port here. The two projects are definitively different. Most likely the port will come much before the ‘new’ so I think it’s still worth having it.
Concerning the discussion about gameplay vs graphics. There are no right answer and any approach to game development is valid. However I don’t think that just throwing nice assets makes a game visually appealing. For me visually a game should be consistent, graphics should serve the gameplay and gives clear information to the player.
Also one thing that is very often forgotten is what is commonly called ‘game feel’. This is basically the loop between the controls and the visual feedback (animations, particles, screen shakes, …). This is something that you generally don’t notice, but if it’s not done properly you feel that something is wrong.
In the same way, having a working game with placeholders that people can play, can hype and push to complete the work. But again no right answers.