yes, definitly good work .
But that has nothing to do with Purebasic generated code.The Tube.asm is handwritten asm, mean everything is optimized.
And of course its a .COM File (DOS) and no native windowsfile. Under Windows you have a minimum Pagesize for every executable (512 byte under win89 and 1024 for NT ) and a few bytes unneeded STUB.
So making cool demos under 10kbyte is good for a windows-exe
(better than the meg-bloated thinks from Db or BB

.