Since you're asking for feedback, here is mine:
1st of all:  this looks really fun and engaging.  Kudos.
2nd: Thinking about this in a MAME cabinet makes me wonder.  What elements would be hard to read or discern on a CRT TV?  Many MAME cabinets have these, so just wondering, would there be an option to increase font size, maybe even bullet size, if necessary?
3rd:  Only because you're asking, i would make only one suggestion: A more polished start screen.  Maybe this is already in the works, but having the fonts lined up properly, and a more traditional start option on screen.  As it is now, it looks very much like a browser flash game.  Again, you're the artist, its your painting   

  .  
Looks fun, though, i'd love to have something newer like this along side the retro stuff in a cab. : )