I can't seem to find a search function on the forum so I hope I'm not flogging a dead nag here (first post).
I've just got my mini and set it up on my 32-inch 1080P HDMI telly.
In all of the zillion videos I've watched showcasing the available games and more, the images and game play look spot-on. However, on my TV the pixels are so massive it looks like a LEGO convention. Is there a way that I can make the viewable screen area smaller so the pixels don't dominate - in essence so my screen looks like the game play videos I've seen on YouTube? I'm not talking about changing the screen resolution to 4:3 or CRT etc. That changes the shape of the screen, not (really) the size.
It is not the screen size that bothering you imho. You should turn on CRT emulation in Settings: it will give you the "feeling" of old TV, but more importantly, it will blur (a little) sharp angles of pixels. Worth a try.
I think what he's getting at is that the C64 mini looks just like it does if you emulate one on a PC, clean, sharp and ultra blocky compared to the real thing on a CRT. Thing is, emulate a C64 on a PC in a small window and that clean, sharp and blocky look can look most excellent, just like a window movie on Youtube. However make that C64 emulator full screen and it will only increase what you see in size from that small window... In other words a PC emulating a C64 at full screen 1080p will look the same as the C64 mini at full screen on a 1080p screen.
It's something you get used too as all people do that have emulated any computer or console from the CRT era on modern hardware. Even a NES and SNES mini suffer with this upscaled blocky-ness. CRT emulation settings try to resolve this but you may not see the proper result at 1080p as the C64 mini and NES/SNES mini's are native 720p. A bit of sharpness is lost when you upscale.
Try sitting well away from the screen if it's too much or use a smaller screen is your best bet.