v 0.6.4 Update

This was an update that was more of a slog in the background than what's visible to the user.

I changed up the upgrades so that they're based on images rather than just text.  It should be a better experience for the user.  One issue is that there are now over 250 upgrades in the game.  Thankfully I remembered the program nanDeck which helped me quickly create images from a template.  It took some fiddling, but it was worth it. 

There's also a "How to Play" level now - so that should cover the basics for a lot of folks.  I didn't dive too deeply into the upgrades and the way that energy can benefit you after a level ends (buying more upgrades, restoring lives, etc.) as I wanted to leave something for the player to discover.

I have to update the Enemy portraits, work on procedural generation of the levels and the main "map", and add a few bosses in.

Thanks for reading!  If you have anything you'd like to share, please comment or join the Discord.