A very funny game! It would be great if your game had sub bosses :)
(I loved the background sound)
Here's a list of the enemies:
1 - The Pawn -> 1 hp, shoots 2 bullets type 0;
2 - The Guard - 2 hp, shoots 2 bullets type 1;
3 - The Patrol - Moves on X-Axis, 2 hp, shoots 2 bullets type 1;
4 - The Kamikaze - Moves on Y-Axis, 3 hp, every time it resets its position speeds up, doesn't shoot;
5 - The SparX's Son - 3 hp, shoots 2 bullets type 3.
6 - SparX is the Boss. After you defeat this guy, you win the game!
Notes; They are listed by order of appearance.
Here's a list of the bullets:
Type 0 - Normal speed;
Type 1 - 1.07% fasters than type 0;
Type 3 - 1.36% faster than type 0 and 1.27% faster than type 1.
With this you can win the game. You can consider, "The SparX's Son" a sub boss.