The latest version adds Graphics Mode 3 (beta). While Graphics Mode 1 has a resolution of 320x180, the new mode provides a resolution of 1280x720. All subroutines except SCREENSAVE and SCREENRESTORE support this new mode.
Pressing ALT + ENTER will now toggle between fullscreen and windowed mode. However, windowed mode is currently EXTREMELY slow. It will be unusable except on the fastest PCs.
Please report any bugs you discover to the Steam discussion forum and we'll address them as soon as possible.
Have fun!