Recently,  I've made a few changes to the game:

• Did some work on the bosses, increasing their hp 
• Changed the first level, so instead of a space stage, it's now a mountain base stage

• Modified some of the boss AI and health
• Added tile-based collisions for the player and tile based collision checking for some of the enemies 
• Removed the web demo due to a bug that recently revealed itself, where the second level boss doesn't extend all of its blades. This so far hasn't happened in the Windows version, in several tests. 

Going forward, I'm modifying some of the bullet code, adding more to the fifth boss, and adding another mechanic and new sprites to the project, for story progression and to add a variance of overall gameplay.