Unlimited bombs (W to release a bomb).
The retro shoot em Nano Best has a incredibly funny story but also fast and powerful gameplay. The upgrade system involves collecting power-ups. However collecting a power-up does not mean that you have upgrade immidiately. You get to choose how you spend them to upgrade your Nano Beast. The game allows you to go totally overpowered with enough collected power-ups. There are 6 chapters altogether.
Use the arrowkeys to move the ship, A and D to shoot, W to release a bomb and S to trigger the powerup level.