This is going to be a tough sell. $150 dollars is very expensive for a portable game system, which will compete with any tablet/phone that can play games that have better graphics and game play. The problem is that this is competing with entire ecosystems of games that have been around for almost a decade.
This isn't meant to compete or be "the best". I think your comment is entirely missing the point of what this is. This is more of a play on nostalgia and classic bulky simple handhelds. It would be in the same category as the NES Classic Edition or the Sega Genesis Mini. It's fun and almost a collectible honestly.
The NES class edition and Sega Genesis only work because of people that remember playing these games as a kid (like me). I have the NES classic edition and my teenage nephews were bored pretty quickly after they played it.
Nostalgia isn't usually there for something new that looks like the games I used to play when I was younger.