Hello!
I've had recently discovered this "HiSMS" emulator (despite it was released back in 2009) - and I'm in love with it because it lets you to create high-definition hacks of Sega Master System games.
Right now I'm modifying "Alex Kidd in Miracle World". All graphics are now 4 times bigger. I'm attaching two videos taken from this enhanced emulator. Hope you like it:

New opening:


First stage gameplay: