Lovely. It also made me play the original Blitz game for VIC20. Too bad there's no congrats message after lv 99 and it just wraps around. :)
City Crusher, original game, 1983 Your Computer magazine.
City Crusher Arcade for VIC20 + 3K
I'll try soon your game. I like very much blitz style games.
Added a link to your game in my City Crusher Arcade page. :)