Good job.
But on Saberman's video I found one game logic bug.
When he lost life, full level is restarted.
This is wrong.
Killed enemies are killed.
Hitted boss is hitted (has less energy).
Some graphics glitches (very rare) are visible.
I dont know if this version has only 1 loop.
But if more loops, then this is perhaps world record:
Loop 9-4.
Every loop is hardest than previously.
More hits to some enemies and plus 1 motor bike per loop.