Oh, thanks for posting that second video! I'm sure the action video works great for some people, but it's not my style, I find those highly stylized, quick cut, action videos can be very misleading about how a game is actually played. They must be effective though because game developers always seem to release trailers like that... Anyway, the second video with the actual gameplay looks very promising, I'm excited for this game!
In the past, games were developed with specific hardware in mind. They didn't really think of how their game would run on modern PCs 25+ years later. Some games even used that as a feature, famously, Space Invaders devs noticed that the game started speeding up as players destroyed more of the enemies because it didn't have to render them and so it made the game harder as you progressed which was more fun!
By the way, there are ways to run retro games with speed limiters, you've just got to look into it more.