Thanks Pyrofer, Yes the C128 VDC makes a very good target for these none hardware sprite type games, such a shame they didn't make more back in the day. I don't think many people realize just how fast the 6502/8502 is at 2mhz!
Yes, when Marius converts the Z80 code to 6502 (like he did for Gunfright & Pentagram) then I will convert his Atari code to work on the C64, C128 VDC & Plus4. As long as no Hardware Sprites are involved then a C128 VDC version should be viable.
BTW, I find the game is much more playable, and a lot easier, if you select Mega Jump in the Extras menu. That was the only way I could complete it when I was testing it!