mkxp VS blah

It depends on what part of Easyrpg you're trying to replicate. If you mean that you want the games to run less crappily on modern systems, and/or you want multi-platform support, then yes. There is mkxp and mkxp-z. However, it's not exactly a plug-and-play solution, and it's something meant to be implemented by the developer of the game, rather than the players themselves.

You can use XP if you like; just use something like mkxp to get modern app behaviors.

Then, take a look at this GitHub repo for a tiny (but very complete) 2D game engine: https://github.com/noelfb/blah

back to the question blah is a small game framework by the person who made Celeste, that lacks in some features but is a great starting point.

For 2d there’s blah by noelfb who made Celeste: https://github.com/NoelFB/blah

As an example, see Noel Berry's small engine: https://github.com/NoelFB/blah He's an experienced indie game dev and he has a small framework (engine if you dare calling it) with not that many features, but is a great learning tool if you're starting, and shows that you don't need a big game engine to make good games.