4 GIGA BOSS FIGHTS

Objective
Fight your way through an onslaught of more than 4 billion consecutive boss fights in top-down shooting arcade action madness. Dodge bullet-hell as your ship automatically shoots the core of the enemy.
Controls

d-padarrow keys: move your ship around
mousetouch: swipe to navigate menus, steer ship with relative mouse hold movements
[z] or [x]: ​spend your power-bar for 3-way shooting extra fire power (2x power when bar is below 50%, 4x when above 50%)
controller pad recommended.

Features

More than 4 billion bosses
22 unlockable player ships
gazillions of bullets
a few lasers!
3 game modes: normal, attract and permadeath
auto game save persistence between sessions (quit the game anytime)

As usual, please share your thoughts, comments and bug reports below. I truly appreciate everyone's feedback.
Also a big shout-out to my #pico8 bros on twitter for giving great ideas and suggestions as I was developing this one. You guys are awesome!
Updates
Jun 28,2019:

Fill up your power-bar as you damage the enemy, press <z> or <x> to spend your power in 2x damage 3-way power shots.
If your power-bar is above 50%, your power is now 4x for maximum boss obliteration.

Feb 11,2019:

Bosses now have Lovecraftian names!

Feb 9,2019:

Optimized a bit (if things get out of hand stop spawning background particles)
This means more bullets, harder game... git gud
Increased the play area a little bit
Less inertia on the ship's movement
Shows the number of tries (game overs) on normal mode

Feb 5,2019:

Fix a permadeath persistence bug
Added touchmouse support

License: None (Free)