April update 2

Added mouse input. Tons of visual updates. Multi-part bosses. Behavior handling updates for all enemies. Testable here: (I wouldn't call it playable yet...). Celebrating adding over 20 enemies + modular parts to the asset pack:
https://ravenmore.itch.io/space-shooter-assets-space-rage

I guess there's no other option now. Player health, enemy bullets and player death?