Cool platformer mixed with tank action, the protagonist gave me some vibes from hollow knight. For the tank section I would make the player control the tank with the keyboard and control the shield with the mouse (or with a stick in case of a gamepad), so to make the player get the timing to avoid the weapons firing at the tank. Graphics are really nice and good use of the 4 color limitation, it gives a Game Boy Color feel to the game. Nicely done. :)