frustrating game: Slow to start, and basically a grind to get $$ for the tank+golden gun. then, its about timing and luck to get large distances -- and with the speeds you fly at, you can't react to hazards, etc -- they just happen.
far too slow at the beginning because of high cost digs and long dig times, and it became mundane by the end because $$ meant nothing. The pace was right for the middle, ~dig5 until ~dig15. better cost and upgrade balancing would make the beginning and end more enjoyable
Also: put kill count one the map, and maybe after each level report "killed X/Y enemies" Possibly record the best done per level so you can aim for "perfects"
Loved the game!
Some improvements that could be made:
1) FX sounds equalized more -- I had no issues with gun noises until i got the minigun, and then it was twice as loud as the music.
2) final "5000 kill" badge is a bit ridiculous. I beat the game, and I still didn't have the 2500 kill badge. I feel like there aren't enough enemies to warrant a goal that high.