@Maemish

I am a huge pinball fan (real and virtual) and even own a virtual pinball cabinet. I think you should forget about installing a homebrew version. They are just not that much fun and are usually pretty demanding as well.
My advise would be to install picodrive emulator and get the psycho pinball rom. That is imho one of the best virtual pinball games on any console.

It has good physics, pretty accurate aiming (so you need skill not luck), very nice table lay-outs and fun ruleset and even nudging. Psycho table gives access to 3 other tables. Really fun.
Works fine on the N900, just played a decent game without sound (score 44.660.270). Not a lot of glitches or frameskips.

https://www.youtube.com/watch?v=p6XmzC_SHU0

Genesis has 100's of games so you can check the library for other types of games as well.