I am most definitely playing this right now. Excellent so far. I know you are busy, so I will just drop a few questions and some points just as a general discussion.
• Will you actually put Mew under that truck? Maybe some short side mission? I think that would be cool.
• How close are you trying to get it to the original games? Does this mean no Johto Pokémon at all? I would be cool with this personally.
•I like the idea of that old guy in Viridian having a Marill, even if you can't capture it in game and even if you can't catch Johto pokemon. It feels like a mystery, an element of surprise wondering where that guy got that pokemon that isn't in the 151. A few pokemon from Johto in the game, again, could be cool to keep the interest of the player. The pokemon would not be able to be captured of course. The Pokémon would be with an NPC.
• Would you actually implement any dual battles in the game? I know you are trying to stay original, but maybe a few updated elements wouldn't hurt?
• I think some hints at Johto in your game would keep some general interest of the player though you (if you choose) cannot get into Johto period. You only hear about it once or twice in the game.
• I know it is a tough idea whether to implement past 151 or not. But today vs 1996 was that Pokémon wasn't planned far enough ahead to know about new types, regions, game mechanics etc. So I know it is a tough battle.
• Will you add the new types like dark, steel and fairy? Again, just some updated game mechanics since they weren't thought of back in the day.
• I think it would be cool to get a mega stone at the end of the game or maybe before the final gym leader. I am talking about Pokémon Origins. I think mega evolutions could be cool towards the end game. Maybe have the final gym leader with a mega evolution or maybe one elite four member.
• What about a Deoxys fossil / DNA in the museum in Pewter? I don't mean you could get it, but I mean that they found some stuff from space. More like a reference, something to alert the player's interest. You don't even have to say the Pokemon by name.
• I think having berries and being able to call people would be a good added mechanic for 2016 for your game.
• I hacked in a Leafeon and an Espeon, that helping hand move is of no use if you take dual battles out.
• I think it would be a nice surprise to include the original Professor Oak battle that was supposed to be in the original games into your game. Professor Oak was a badass.